Database Develop

BandSel_BAWWE_140921.sa.CAB

Is anyone else running this cab file??
Before loading it, I pulled it apart with a cab editor to see what it was. I was very excited to see that it uncovered the radio band selction capabilities, so I quickly installed it.
But this where things got funny. I refuses to give me the option for the for GSM 1900, although it is clearly called out in the registry edits the cab lays down. I am running the 1.13 radio, with system 1.40.00, and was wonder if anyone else can verify this as a problem? I am wondering if this is a software issue in either the cab, system, or radio... Or to my horror is the SX66 retarded to triband???
-Chris

Ok, looks like TheLastOne answered my question in another post. Funny that the site search failed to turn this up:
1) Phone Band Selection: BandSel_BAWWE_140921.sa.CAB
- I've played with this a bit, their cab is actually ****ed up, as they have tried to get 6 selections onto the page when only 5 are possible. Through the registry you can have any band configuration you want selectable. I personally LOVE this feature.
GSM 1900 is the 6th selection, hence it doesn't show up. But this now leaves a glaring question, what are ALL the selectable options? I note the 900/1800 option with a value of 3, but is there a 850/1900 option(This would be prefect when I go to aruba), and what is that value??
GSM900 has a value of 1
GSM1800 has a value of 2
GSM900/1800 has a value of 3
GSM1900 has a value of 4
Automatic has a value of 7
gsm850 has a value of 8
So, what are values 5 and 6?? I could set those values, but I have no idea how I'd check to see what band I am current using. Anyone got any thoughts?
-Chris

Either 5 or 6 is 850/1900, from my tests, but I forget which.

If you don't mind, how did you determine that?
-Chris

In my location, I have access to two GSM networks, one which is exclusively 1900 and the other is 850. Set to either 5 or 6, I could get on both. (So I'm not positive it's EXCLUSIVELY 1900 and 850, since there is no 900 or 1800 here to test).
I did this a bit ago, so I don't properly remember.

The value is a bitmask:
bit 1: 900
bit 2: 1800
bit 3: 1900
bit 4: 850
so 5 means 101b - 1900+900
6 means 110b - 1900+1800
Setting 7 would make GSM to use 900, 1800, 1900
Probably the GSM part also tries to register on 850Mhz when 1900 is selected.

Mamaich,
You rock. You never cease to amaze me. Very cool, thanks.
-Chris

Can you post a link to this CAB file?

Modified Band Select CAB for USA
I modified the CAB for USA only 850, 1900 and Auto

I ran the updated CAB file you posted here, seems to be working ok, although signal strength (on the new bands) seems to be weaker than what I had before installing the cab. I am wondering, is there ever away to revert back to the original band options or settings ?

I am wondering the same thing, because NONE of the 3 options i had available to me when I installed this (Auto, GSM 850/1900 (NA), GSM 900/1800(Euro/Asia) were selected.
When I selected Auto, I began ROAMING, and I'm not certain why. The only way I know of to return this back to factory state is to hard reset.
Does anyone have THE ORIGINAL CAB, before the mods were made so that ALL options were available?? I'd really like to have that cab so that I can see what option my PDA2k on Cingular was using...

Here is the original CAB file, it did not work on my SX66 (see the first few posts on this thread) so I modified it to use only 850/1900 and Auto. I have had no problems with the modified CAB. Signal strength has not been degraded.

thanks, Cruzzer.
the modified CAB put me into permanent ROAM no matter what frequency I chose (or killed the phone entirely because there wasn't a 900/1800 tower).
I managed to get a hold of Chris and he helped me make some registry mods that gave me the original functionality back.
Interestingly enough, I had to put the phone thru a couple of different SR's before it would stop roaming, even after switching back to JUST 850.
Goofy, huh?

Care to go over the registry edit you made? Thanks.

Question
First of all, thans for the Band Select created by Cruzzer for US users. After I install his band select, it's the first time that I can use my phone in my office located in a basement. But I have a problem. In his band select, there are three options, automatic, GSM 850, and GSM 1900. When I selected automatic, my phone couldn't find the network. But when I selected GSM 850, it works perfectly. At first, I understand that by selecting my phone to automatic, my phone should search both GSM 850 and GSM 1900. But I don't know why it always show no network. Did I do anything wrong?
By the way, my phone is O2 XDA IIs brought from Thailand. (O2 Asia)

I believe that there is a bug in BA when working with GSM850.
In fact, automatic should search between GSM850, 900, 1800 and 1900.
Usually when using "automatic" where GSM850 networks exists, makes BA not being able to find any network.
Are you using WM2003SE ?
JP

Yep WM2003SE
Yes, I'm using WM2003SE.
I also tried another band select created by one of our members in http://forum.xda-developers.com/showthread.php?t=297099 His band select gives four options:
1. automatic
2. GSM 850/GSM 1900 (north america)
3. GSM 900/GSM 1800 (Europe)
4. Reset Values to Zero
When I selected GSM 850/GSM 1900 (north america), my phone had no signal. So, right now I have to go back to BandSel_BAWWE_140921.sa.us and manually select GSM 850.

Yes, unfortunely, that seems to confirm my teory.
If it works for you at 850, keep at that. Just remember that if you upgrade to WM6, band selection will not be available and it will be locked to your choice done in WM2003, in this case 850.
Your BA, will no longer be quad-band (the same as mine).
JP

Too bad
Thanks for confirming the bug in BA. Too bad. I want to upgrade to WM6 but I know there is no way to select which band in WM6. So...I'm stuck with WM2003SE. I wonder, can we edit the registry to manually select the GSM band in WM6?

I've tryed and some other did also, but it seems that both the .cab and also registry tweaks for band selection do not work on WM6.
It does not mean that you will have a problem with WM6, but rather that the band that you have selected on WM2003 will remain "locked" when using WM6 and cannot be changed.
In my case, i'm using the 900/1800 band selection and it works just fine with WM6 (i've used Helmi's and now i'm using Xplode's) but i cannot select 850 for example.
JP

Phone Band Settings

Is there any way to configure the UMTS Band settings on the Trinity / D810? I ask as the ROM provides the following options:
Network Type:
Auto
GSM
WCDMA
GSM/UMTS Band:
Auto
GSM(900+1800)+UMTS(2100)
GSM(1900+850)+UMTS(1900+850)
UMTS(2100+800)
Now ... for the HSDPA Network in Australia for Telstra (Next G), I need the phone to work on the UMTS(850) Band. However, by selecting the option above where the only UMTS(850) is available means that the alternate 3G Band (not HSDPA) of UMTS(2100) is not available, and the GSM Bands in the same selection are not valid for the Australian market.
Couple of queries, and I hope there are ways of configuring the device to achieve this (without getting a new ROM to support it):
When a Band selection is made, what is the order which the device uses the connections? ... i.e. if the selection was GSM(1900+850)+UMTS(1900+850), will it look for UMTS or GSM first? If UMTS, which band - 1900 or 850?
When Auto is selected, I am guessing it uses each option in the list until it finds a valid network? This would mean that for Australia, if left on Auto, you would never select HSDPA for Telstra as it would find the 3G UMTS(2100) network first (non-HSDPA).
My assumptions are that if left on Auto, it looks based on list order (which is the network order in the registry). So, for Australia, I need a setting like the following:
GSM(900+1800)+UMTS(850+2100)
Is it possible to create this Band Selection without a new ROM?

AJB said:
Is there any way to configure the UMTS Band settings on the Trinity / D810? I ask as the ROM provides the following options:
Network Type:
Auto
GSM
WCDMA
GSM/UMTS Band:
Auto
GSM(900+1800)+UMTS(2100)
GSM(1900+850)+UMTS(1900+850)
UMTS(2100+800)
Now ... for the HSDPA Network in Australia for Telstra (Next G), I need the phone to work on the UMTS(850) Band. However, by selecting the option above where the only UMTS(850) is available means that the alternate 3G Band (not HSDPA) of UMTS(2100) is not available, and the GSM Bands in the same selection are not valid for the Australian market.
Couple of queries, and I hope there are ways of configuring the device to achieve this (without getting a new ROM to support it):
When a Band selection is made, what is the order which the device uses the connections? ... i.e. if the selection was GSM(1900+850)+UMTS(1900+850), will it look for UMTS or GSM first? If UMTS, which band - 1900 or 850?
When Auto is selected, I am guessing it uses each option in the list until it finds a valid network? This would mean that for Australia, if left on Auto, you would never select HSDPA for Telstra as it would find the 3G UMTS(2100) network first (non-HSDPA).
My assumptions are that if left on Auto, it looks based on list order (which is the network order in the registry). So, for Australia, I need a setting like the following:
GSM(900+1800)+UMTS(850+2100)
Is it possible to create this Band Selection without a new ROM?
Click to expand...
Click to collapse
The new Dopod ROM has the same band selections as yours does. I tried changing the selections to manual with bad results. I just leave it on auto now.

Matterhorn said:
The new Dopod ROM has the same band selections as yours does. I tried changing the selections to manual with bad results. I just leave it on auto now.
Click to expand...
Click to collapse
I could do that to, but it would mean I don't get HSDPA. I have verified this. The only way to get HSDPA is to set the Band selection to the one with UMTS(850) in it ... this is not ideal, and that's why I posed the question to this forum.

No one??
I am guessing that no one has ever come across this, or needed to do it?

Registry Patch
This Registry patch works for the Hermes. It might work on the Trinity.
[HKEY_LOCAL_MACHINE\SOFTWARE\OEM\PhoneSetting\BandType]
"ItemCount"=dword:00000006
"ItemName1"="Auto"
"ItemName2"="GSM(900+1800)+UMTS(2100)"
"ItemName3"="GSM(1900+850)+UMTS(1900+850)"
"ItemName4"="UMTS(2100+800)"
"ItemName5"="GSM(900+1800)+UMTS(2100+850)"
"ItemName6"="GSM(900+1800)+UMTS(850)"
"ItemValue1"=dword:00000000
"ItemValue2"=dword:00000001
"ItemValue3"=dword:00000002
"ItemValue4"=dword:00000003
"ItemValue5"=dword:00000004
"ItemValue6"=dword:00000005
[HKEY_LOCAL_MACHINE\SOFTWARE\OEM\UMTS\BandSelection]
"Band"=dword:00000005
You really just need to add ItemName5 and 6, and ItemValue5 and 6, and change the ItemCount from 4 to 6 (as you added two options) using your favorite Registry Editor.
Do a soft reboot of the phone. Now you can select the NextG option GSM(900+1800)+UMTS(850)

3G connection
I drive around the Perth Metro area a lot for work and am finding that if left on Auto the connection is lost quite often mid call. How have you found the 810's management of the bands? And the auto fallback? Is there a way to set the fallback threshold so it drops back if under 2 bar signal strength? At the moment it sits on 1 bar strength and drops out mid call.

USA 3g

I understand that currently the Diamond does not support 3g data in the USA. There are rumors that the Diamond will eventually release in the US on the GSM network sometime after the CDMA release. Seeing as HTC already proved that sometimes they can enable frequencies with just a radio rom update, do you think the current Diamond will someday be able to support 3g in the USA?
I sold my Tilt a few weeks ago and got myself an Iphone. I am starting to hate the Iphone and really would like to go back to a WM device. But the Tilt is not an option and the only phone that looks worth the jump is the Diamond. But I do not want to buy a phone that will never be able to support 3g. Edge is just too slow, and with AT&T you pay the same data rate for an Edge or a 3G phone.
I have done plenty of searches and can't seem to find any conclusive answers. Maybe there isn't one.
Thanks for any suggestions you may have. Please don't turn this into an iphone bashing thread. The iphone has many good qualities, it just does not suit my needs as I thought it would.
Jeff

no you must wait for the local diamond release. they are hardware specific.

Well that just sucks. I guess I will have no choice but to wait for the Diamond or the Xperia to invade our borders.

its does suck, i have a Diamond from Asia and i cant use the 850Mhz 3G Telstra network.... lucky for the 3Telstra joint venture network!

I thought that was one of the benefits of the new 1.93 ROM, it utilizes 850Mhz, no?
Mark

thats only GMS band and is also only sim card specific. i have the 1.93 rom and a telstra next g sim and i only get UMTS (900-2100) + GSM (900+1800) bands...

frozenwaffles said:
no you must wait for the local diamond release. they are hardware specific.
Click to expand...
Click to collapse
Thats just a bummer. Guess it's edge for me, unless something miraculously happens

Can anyone explain exactly what it will take for HSDPA in the US?
Hi -
Similar to the original poster, I have been watching with anticipation the development of the Diamond and the XDA cookers' work on unlocking its capabilites. I too am confused, with many conflicting posts about the ability to do HSPDA in the US. Can anyone explain exactly what it will take? Based on my understanding:
1.) Ability to transmit and recieve on the radio frequency used by the telco / phone company for UMTS service (Universal Mobile Telecommunications System). For AT&T, I thought this frequency was 850 mhz. Based on peoples' reports and some testing done, it seems like the Diamond can be unlocked through a ROM flash to broadcast and recieve on 850 mhz. So far, so good.
2.) Ability to use the UMTS service
My reading of Wikipedia seems to say that UMTS is a "technology" -
This is different from a "standard" like GSM,which is an integrated system of hardware (radio transmitters and towers), an "air interface" (a set of protocols to handle packet transfers, analogous to TCP/IP on the Internet, only using radio waves rather than wires), an "infrastructure" (base station sub-system and GPRS (packet) subsystem - towers and the computers and routers that connect them) and connection software (validating users, tracking usage, billing, transmission control codecs, etc.). UMTS is a collection of transmission control codecs and user identification codecs operating within a GSM network. So, UMTS is a phrase that describes improvements to the old, 2G GSM protocols. But it is still GSM.
AT&T in the US is using WCDMA as the "air interface" over which it is running its UMTS service. It is using the 850 mhz frequency. One key difference between GSM and UMTS is that UMTS uses a "Universal Subscriber Identification Modue" (USIM) rather than a plain old Subscriber Identificaton modue (SIM). If AT&T's UMTS service requires a USIM, then having only a SIM will prevent you from accessing the UMTS service - you will only be able to access the data service offered by the GSM, which is EDGE in the US, not WCDMA (i.e., only 2G). This is regardless of hardware. If this is the case, then it's a bummer.
HOWEVER....the UMTS service CAN use SIM cards as well, so AT&T may have theirs configured to use SIM cards as well. I currently have the HTC Trinity with what I think is a SIM card - I was forced to "upgrade" the SIM card when Cingular "integrated" with AT&T, so my card is branded Cingular, but has the snazzy 3G fireball on it. So maybe it's actually a USIM? My Trinity does have the "H" icon show up, and I can get 300kbps or so tethering to my laptop (but not above that - grrrr...) so maybe I'm getting UMTS service on that device? If so, then the SIM vs USIM should not be an issue if I got a Diamond.
3.) Ability to use the HSPDA protocol
As far as I can tell, HSPDA is pure protocol - just like TCP/IP. It achieves faster speeds by using fast packet scheduling and something called adaptive modualtion and coding. It is part of the UMTS standards, so it's actually part fo the overall UMTS system, but not everyone uses it. If your phone and your carrier can use this protocol, you can get HSPDA.
Based on the above, it seems reasonable that the Diamond is capable of transmitting at HSPDA speeds in the US on AT&T's network. Has anyone been able to actually do this? If not, could those much more informed than me explain the obstacle? Is it a setting on AT&T's side? A setting on the Diamond? Is the radio hardware for UMTS somehow different? Does the Diamond lack WCDMA capability due to lack of software?
I understand that some people have tried selecting the band on their ROM-flashed phone to get 3G on AT&T with no success, but that doesn't mean it can't be done. I'm trying to understand the eaxt nature of the obstacle.
Thanks!!!
Mike

I can't speak for all the technical hardware specs possibilities. But here's the latest status as i understand it:
1. There are at least 2 GSM-based Diamond versions available now: DIAM100 and DIAM130. The DIAM100 is the original one that went on sale. The DIAM130 seems to be the new Telstra Diamond that does support 850 3G.
2. There are lots of radio ROMs out available now. Some unlock 850 GSM for the DIAM100, which was previously thought impossible due to lacking of an 850 radio antenna. But that was a lie obviously. No Radio ROMs are currently avail that have successfully unlocked 850 3G. And since the DIAM130 is the only one working on 850 3G (using a radio ROM that is available for the DIAM100 even), the prevailing thought is it is actually a HW limitation on the DIAM100. I.e. it cannot do 850 3G no matter the radio ROM. (Note that OS ROMs have no effect on the radios ability. However, they might unlock the availability of the frequency selection in the Phone Settings window on WM. Note also that simply the existence of a selection in that window does NOT mean it physically can do that frequency.
3. No radio ROM thus far has made any iteration of the Diamond capable of doing 1700 anything, which is what TMo US would need for its 3G network. So, if a TMo US one is to become available, it would be yet another HW version.
#2 and #3 are still just theory, but pretty solid ones at this point.
So, my question is re: the DIAM130. What other 3G bands is it capable of. Only 850? Is it still quad-band GSM capable? If its flashed with other Radio ROMs, does it still maintain the same capabilities? I'd consider getting one if possible and using it here on AT&T if it is (or can be) quad band GSM and 850 3G. Esp if it still had 2100 3G, or even if it could be flashed when necessary to support 2100 3G when I travel. The lengths I've considered going to for this.
In any case, I lose more and more interest in this product each day. I'm inching closer to a hopeful AT&T Omnia, which too has drama surrounding it. And since I just got my g/f an iPhone 3G, I hate to admit, I'm heavily considering one as well now. What I might lose in flexibility, I think I would gain in having a solid device, that works worldwide 3G, and would keep everything I want in sync.
Sad really. I've been a WM-trooper for a decade now. 80% my music is in WMA format. For the stupidity of these dramas, WM may very well lose a devotee. (And as you can see from my willingness to import the phone and flash it whenever necessary, I'm not just giving up, I'm trying my best. but when the companies make it this hard, you gotta question if its worth it.)

Thanks Jomo!!!
Sounds like we're in the same boat. I won't get an iPone because part of my reason for having the phone is being able to tether to my laptop in an emergency. If the Diamond can't do it, I'll stick with my Trinity, which can. Really, I just want the better form factor...
One thing that has me confused is the whole radio thing. I'm no electrical engineer, but it seems like there are two components to the "radio" of the cellphone.
1.) The hardware - specific physical characteristics like the length of the antenna will determine the frequency you can use. I remember the old days of citizens band radios (that's CBs to those good buddies who saw Convoy <grin>) where you had to change physical crystals to get the right frequencies. Yes, apparently I'm old (geez, when did THAT happen???). I can also see the clock cycle of the radio's DSP determining how quickly the radio can handle packets.
2.) The software - herein lies all the nitty gritty details about protocols and the like - you need to have radio software that uses all of the hardware - like "turning on" the 850 band.
I guess the real questions for you gurus out there are
a.) how much of the UMTS protocol is programmed into the chip versus based on software (more software-based would support there being a software solution)? The chip used in the Diamonds is the Qualcomm 7201 chipset (at least the GSM ones do) which specifically lists UMTS as a capability, so it seems like the software just isn't using it right.
b.) do you need hardware components for each frequency of UMTS?
It just seems that going from GSM to UMTS is a matter of using different software, although you would have to have hardware capable of UMTS speeds. Ifthis is the case, then a hardware solution is possible. If it requires sepcial software to add into the existing software, we may be out of luck until one is created with the right stuff.
Ugh. My head hurts. Learning cellular radio through internet research is not easy. I suppose it would be easier if I were smarter <grin>
Mike

This may be old news, and still doesn't answer the querstion whether the current batch of Diamonds can be software / ROM updated to do US 3G, but at least there is a device that can - the product name DIAM110 (as opposed to the DIAM100 and DIAM130) has been submitted to the FCC a while back and definitely does do 850 UMTS.
http://www.mobileburn.com/news.jsp?Id=5028
Good luck!
Mike

Excellent thread!
Very informative - thanks for doing the research and putting it all in one place! I too am somewhat confused as to the availability of 3G data access on AT&T - this thread has helped me understand some of the technologies involved and raised some interesting questions.

3.5G is backwards compatible with 3G
I just read in the wikipedia that 3.5g is backwards compatible with 3G tecnology, so i cant find the point in which Diamonds just CANT use regular 850 3G. Perhaps is just a little tweaking over the HW. But I believe it will be done sooner or later

DIAM100 with RTR6285?
Thanks for the informative post. I've been looking for the answer to this question long before I got my diamond. Here's what I've found so far. Hope it helps.
According to this page and this page, Diamond uses Qualcomm RTR6285 as its RF Transceiver. And based on the press release from Qualcomm,
The RTR6285 transceiver supports the following bands:
* North American triple-band UMTS (bands 2, 4, 5)
* Japanese triple-band UMTS (bands 1, 6, 9)
* European, Chinese and rest-of-world triple-band UMTS (bands 1, 3, 8)
* Global quadruple-band GSM and EDGE (800/900/1800/1900 MHz)
Note that "North American triple-band UMTS (bands 2, 4, 5)" means it supports 1900MHz, 1700MHz, and 850MHz
Here's the wiki page that lists the UMTS frequency bands
Many users on this forum mentioned that Diamond lacks 850MHz 3G support due to the hardware limitation, but that contradicts the RTR6285 press release. Can somebody please confirm that DIAM100 uses RTR6285?
Thanks,
Bruce

WOW!!! bruce0126 you just make my day!!!

Keep the dream alive people!

So if its the same Hardware then what is keeping the phone from working on UMTS 850 band?
The ROM is activated for the North American frequencies so its not a ROM issue.
Thats ODDDDDDD

could it be lack of antenna for those specific bands?

we need a techwiz!!
Ive seen the specs also and the radio hardware is supposed to recieve at 850mhz, perhaps the transmited has been " Programmed" in factory to forbid the use of this particular band. Of course im only guessing.
Any one has a good new about american 3G in our DIAM100 ??

Mods Can You Make This Thread Sticky?
I wnder wy the Mods havent dne this thread as sticky ;O
Sticky it please!

Cant get 3G only symbol is E

I bought my HTC Diamond on UK. I updated the ROM to the RUU_Diamond_HTC_HK_WWE_1.93.831.1 this was supposed to make my phone QuadBand. It does work in USA (Boston) where I live. But I have never seen my phone doing 3G and speed test top was around the 1xx kbps.
Any Ideas?
PS. I am on the ATT network

Are you sure you have 3G coverage in Boston? Do you have a USIM-card (which I was told to be required for UMTS stuff)?

3G speed
I did look at the ATT coverage map and it said that I do have coverage.
How do I know what type of SIM I have? The SIM does have the 3G logo on it.

Are you sure your phone has the bands?
Check the Band setting, Settings->Phone->Band,
in the dropdown box for "Select your GSM/UMTS band", my US 3G ATT phone shows the following options:
Auto
UMTS(850+1900)+GSM(850+1900)
(oddly enough, the settings have to be on Auto for the phone to work..)
When I bought my diamond, I was curious about my sim too, so I took it into the ATT store and asked if it was the "latest 3G sim" and he said yes. Mine is half white (top) & half Blue (bottom), with a orange 3G fireball in the topright corner.
If yours matches all that, then take it to the ATT store and see if you get 3G in the store
Also..if you have doubts, I've had multiple Sales reps in the store tell me I can get a new Sim for free at any time, just need to ask.

3G
I do have that SIM half blue half white with the 3G fireball logo.
On my select network I have
Auto
GSM
WCDMA
on the GSM/UMTS band I have
Auto
UMTS(900+2100)+GSM(900+1800)
UMTS(850+1900)+GSM(850+1900)
UMTS(800+2100)
UMTS(850+2100)+GSM(900+1800)
UMTS(850)+GSM(900+1800)
UMTS(1700)

rpassmore
What ROM do you have?

RUU_Diamond_HTC_Europe_1.93.401.2
RUU_Diamond_HTC_Europe_1.93.401.2
Does this ROM supports USA 3G????

Sorry for my English
You have the European version and have only HSDPA 2100 / 900 (3G) and probably ATT works in HSDPA 850 / 1900, if this is the problem, sorry 3G is impossible for you, because is a hard problem, not a soft problem, search in this web there are many post about this. The European is quad band in GSM but not in HSDPA (3G)
CArlos

How about if I use another ROM
If I use another ROM ? would I be able to do 3G?

No I think it's impossible since it's different hardware I believe.

I think the one you have from UK, it only contained HSPA 2100 and US /Canada is using HSPA 850/1900, that's why you don't have the 3G signal.
Quad band only for voice and EDGE.

cmilian said:
rpassmore
What ROM do you have?
Click to expand...
Click to collapse
I'm using the stock rom/radio for the Unlocked US 3G.
1.93.422.4 WWE
1.00.25.08
But I missed the fact that you're using a European Diamond. sorry.

is there any conection betwen 3G and front camera....
i think i have an Eropean model from UK Vodafon which has the front camera... but i am not sure about 3G !
????

[Q] change modem or unlock needed for traveling with a Tmo tab w overcome?

Hello experts,
Would you please tell me if I need a new modem (currently on T849UVJJB, assuming that's stock modem), or do I just need to carrier unlock my tmobile branded galaxy tab in order for me use pre-paid sim from other countries such as Hong Kong or Taiwan.
I have already rooted my galaxy tab and installed Overcome 3.0.0 on it. I am interested in voice + data, but all these different radios and talks of voice calling is disabled on the tmobile server's side (thus only network unlock is required to get voice +data) had me confused.
Greatly appreciate it if someone can clear it up, thanks.

To use any sim besides t-mobile, you need to unlock.
You will need to root your tab, then unlock it.
Since there is no compatable network in China the best you can get is voice and EDGE data.
Use a froyo modem.

Thanks rangercaptain for your reply.
As I mentioned I have overcome rom installed, thus I am already rooted. I also installed from the market galaxy_s_unlock, and it seems to be working (although I won't be able to find out until later when I travel.)
you mentioned it will only do EDGE, which I am dumbfounded:
-most Asia (including China) and Europe support UMTS 2100, known as Band I
-Tmobile galaxy tab spec page listed it supported both UMTS 2100 (Band I) and UMTS 1700 (AWS)
I am traveling soon so I guess I will report back. But if there is any actual report from users that would say one way or the other it would be awesome.
Thanks.

The word "and" is the key. The t-mobile tab has to have 1700 and 2100 bands to have 3g/H. Outside of US t-mobile service area, the 2100 band is available, but no 1700 band.
Go prepared for EDGE and be pleasantly surprised if you get 3g. It has worked out in a few places.

well, I am at Hong Kong right now, and here's what I found:
I am using hutchison 3G, JPE modem.
Yes I get voice. Data: GPRS works, EDGE works (though most of the time is G)
But whenever the icon indicate 3G (even with 4 bar) I get no data, at all.
Here the head scratcher: When 3G swtich over to the letter H, if it is above 3 bar I can get data! But I thought 3G and HSPA is on the same frequnecy and if it works for H it should work for 3G also.

That's because the bands for 2100 match, and the US 1700 band and the overseas 1900 band have a small overlap, so you occasionally hit the sweet spot.