Database Develop

Using GSM on Paranoid Android

Hello all,
As always, apologies in advanced if the solution ends up being simple, or that I've obviously overlooked something.
I have a Sprint HTC One. I live in Europe so I have rooted my device and also performed a SIM Unlock.
I was successful and the phone recognized my 3 Network SIM and works fine.
I have tried several different ROMs recently (Cyanogenmod, Carbon, Viper and Paranoid Android) and in each of them I cannot get the phone to switch networks away from SPRINT.
I switch the Network mode to GSM/WCDMA and double check in the phone info menu (*#*#4636#*#*). Reboot, and still no luck.
Oddly, I sometimes receive messages to my phone, but I cannot send any and there are no APN settings whatsoever.
It is necessary to be on stock to perform the SIM Unlock, so does that mean it will not work when I flash new roms?
Is there a setting in Paranoid Android (for example) that I am overlooking?
Thanks.

Can't...No supported

david279 said:
Can't...No supported
Click to expand...
Click to collapse
Thanks for the reply.
Are there custom ROMs for m7spr that could support GSM? Or is it completely non existent?
I have tried stock for several months and would rather not go back.

GMach234 said:
Hello all,
As always, apologies in advanced if the solution ends up being simple, or that I've obviously overlooked something.
I have a Sprint HTC One. I live in Europe so I have rooted my device and also performed a SIM Unlock.
I was successful and the phone recognized my 3 Network SIM and works fine.
I have tried several different ROMs recently (Cyanogenmod, Carbon, Viper and Paranoid Android) and in each of them I cannot get the phone to switch networks away from SPRINT.
I switch the Network mode to GSM/WCDMA and double check in the phone info menu (*#*#4636#*#*). Reboot, and still no luck.
Oddly, I sometimes receive messages to my phone, but I cannot send any and there are no APN settings whatsoever.
It is necessary to be on stock to perform the SIM Unlock, so does that mean it will not work when I flash new roms?
Is there a setting in Paranoid Android (for example) that I am overlooking?
Thanks.
Click to expand...
Click to collapse
One of the threads mentioned that you need to be on 1.29 to use sim unlock.
It works for me in Bangalore, India so should definitely work for you as well...you might have to downgrade...
I'm on Viper 1.1.0.

indy1811 said:
One of the threads mentioned that you need to be on 1.29 to use sim unlock.
It works for me in Bangalore, India so should definitely work for you as well...you might have to downgrade...
I'm on Viper 1.1.0.
Click to expand...
Click to collapse
By 1.29 are you referring to the Stock version?
I have successfully SIM unlocked, but all the ROMs tried simply do not pick up a signal.
I will try Viper 1.1.0, perhaps I used a known incompatible version beforehand.
Thanks for your reply.

indy1811 said:
One of the threads mentioned that you need to be on 1.29 to use sim unlock.
It works for me in Bangalore, India so should definitely work for you as well...you might have to downgrade...
I'm on Viper 1.1.0.
Click to expand...
Click to collapse
I am still having trouble connecting.
Can I ask what you did when setting up, did the ROM automatically connect you to your network?

GMach234 said:
I am still having trouble connecting.
Can I ask what you did when setting up, did the ROM automatically connect you to your network?
Click to expand...
Click to collapse
Do you get the message "Switch to global mode" when you rebooted your phone? You have to select Yes to that for the network to be detected.

indy1811 said:
Do you get the message "Switch to global mode" when you rebooted your phone? You have to select Yes to that for the network to be detected.
Click to expand...
Click to collapse
No I don't, but I can switch to that mode under mobile settings and it still does not pick up a signal!
I've started a new thread in the troubleshooting section with more of an explanation about my problem:
http://forum.xda-developers.com/showthread.php?t=2460808

GMach234 said:
Hello all,
As always, apologies in advanced if the solution ends up being simple, or that I've obviously overlooked something.
I have a Sprint HTC One. I live in Europe so I have rooted my device and also performed a SIM Unlock.
I was successful and the phone recognized my 3 Network SIM and works fine.
I have tried several different ROMs recently (Cyanogenmod, Carbon, Viper and Paranoid Android) and in each of them I cannot get the phone to switch networks away from SPRINT.
I switch the Network mode to GSM/WCDMA and double check in the phone info menu (*#*#4636#*#*). Reboot, and still no luck.
Oddly, I sometimes receive messages to my phone, but I cannot send any and there are no APN settings whatsoever.
It is necessary to be on stock to perform the SIM Unlock, so does that mean it will not work when I flash new roms?
Is there a setting in Paranoid Android (for example) that I am overlooking?
Thanks.
Click to expand...
Click to collapse
I was able to use the ViperBoy ROM to stay on GSM with the advent of 4.3 official release I am wondering if the newer ROMS based the Sprint release will cater to GSM w/data cause its quite a bother not benefiting from the other perks

I'm using the "Stock with Goodies" ROM successfully on Vodafone in Spain. The OP is mentioning all AOSP rom's that don't work with a SIM card. Any sense based ROM will work(such as Viper). The only AOSP type ROM that I managed to pick up any signal on was the GE Nocturnal ROM after flashing this zip, https://mega.co.nz/#!dgdmFQbb!ZXw8Q18FwMU0Xn_t3_Prp2dcd9Fn01pdR5s3Ha-_TaI . This GSM patch was very alpha, it had numerous telephony.db force closes and disconnects frequently. The DEV for GEnocturnal said he would try to make the next 4.3 based GE rom internationally compatible so that's our best hope for using stock Android as of yet.

There's a guy using the CM 10.2 rom I built in the android dev forum. I don't know how it's working but it's working for him. He has voice and h+ Data just the signal bars don't show the correct signal.
Sent from my One using Tapatalk 4
---------- Post added at 01:56 PM ---------- Previous post was at 01:55 PM ----------
http://forum.xda-developers.com/showthread.php?p=46273733
Sent from my One using Tapatalk 4

david279 said:
There's a guy using the CM 10.2 rom I built in the android dev forum. I don't know how it's working but it's working for him. He has voice and h+ Data just the signal bars don't show the correct signal.
Sent from my One using Tapatalk 4
---------- Post added at 01:56 PM ---------- Previous post was at 01:55 PM ----------
http://forum.xda-developers.com/showthread.php?p=46273733
Sent from my One using Tapatalk 4
Click to expand...
Click to collapse
That's really interesting. I am using a Sense ROM with an international carrier and I get only GSM in data. Can you help me get 3G/H sign??

elvisypi said:
That's really interesting. I am using a Sense ROM with an international carrier and I get only GSM in data. Can you help me get 3G/H sign??
Click to expand...
Click to collapse
That guy just flashed it and it worked for him.
Sent from my One using Tapatalk 4

Sprint HTC ONE M8 H/K Edition gsm bands

Hello guys i am planning to buy the harman kardon edition of the one m8.....do you know the the gsm bands that the sprint m8 has?i read somewhere that it's quadband..also how many % chances you believe i have sim unlocking it?

Djmk4 said:
Hello guys i am planning to buy the harman kardon edition of the one m8.....do you know the the gsm bands that the sprint m8 has?i read somewhere that it's quadband..also how many % chances you believe i have sim unlocking it?
Click to expand...
Click to collapse
You can check the bands and frequencies for SPRINT here:
http://www.gsmarena.com/htc_one_(m8)_cdma-6233.php
For the sim unlock it is up to "firewater" compatibility, since you need to S-OFF your device first.
Regarding compatibility with firewater, your question should be: How can I make sure that my device will be supported by firewater?
The answer: You cant! Its just a matter of luck for the moment.
There are alot of people who successfully S-OFF their devices with firewater, and there are also unlucky persons like me, who cant (i got 2 devices that i cannot S-OFF).
There is also a bounty thread for people which cannot S-OFF:
http://forum.xda-developers.com/showthread.php?t=2733870
If SIM unlocking is your concern, I suggest you to buy it unlocked (yeah i know the price is higher).
For the time being there is no provider offering SIM Unlock for Sprint. Believe me, since I have a SPRINT standard M8 device which i cant SIM unlock for the moment.

blackice666 said:
You can check the bands and frequencies for SPRINT here:
http://www.gsmarena.com/htc_one_(m8)_cdma-6233.php
For the sim unlock it is up to "firewater" compatibility, since you need to S-OFF your device first.
Regarding compatibility with firewater, your question should be: How can I make sure that my device will be supported by firewater?
The answer: You cant! Its just a matter of luck for the moment.
There are alot of people who successfully S-OFF their devices with firewater, and there are also unlucky persons like me, who cant (i got 2 devices that i cannot S-OFF).
There is also a bounty thread for people which cannot S-OFF:
http://forum.xda-developers.com/showthread.php?t=2733870
If SIM unlocking is your concern, I suggest you to buy it unlocked (yeah i know the price is higher).
For the time being there is no provider offering SIM Unlock for Sprint. Believe me, since I have a SPRINT standard M8 device which i cant SIM unlock for the moment.
Click to expand...
Click to collapse
Thank you for the information..I'm an htc lover...i can buy it factory unlocked in about the same price...but i want that version...i really liked the color combination and what h/k addition offers...i know that i can port the h/k software to another m8 but i like the whole package...it's unique....i live in Greece....bought my friend some months ago an already sim unlocked sprint htc one m7 and it's working fine..So to sum up..if i got it...it's not 100% that i would be able to sim unlock it..... Also i saw on the gsmarena on the lte frequencies sprint version support LTE 800 / 1900 / 2600 my carrier lte frequencies are 1800 MHz, 2600 MHz...... so i should be able to have lte at 2600MHz?

Djmk4 said:
Thank you for the information..I'm an htc lover...i can buy it factory unlocked in about the same price...but i want that version...i really liked the color combination and what h/k addition offers...i know that i can port the h/k software to another m8 but i like the whole package...it's unique....i live in Greece....bought my friend some months ago an already sim unlocked sprint htc one m7 and it's working fine..So to sum up..if i got it...it's not 100% that i would be able to sim unlock it..... Also i saw on the gsmarena on the lte frequencies sprint version support LTE 800 / 1900 / 2600 my carrier lte frequencies are 1800 MHz, 2600 MHz...... so i should be able to have lte at 2600MHz?
Click to expand...
Click to collapse
Im not quite sure if the LTE will work flawlessly since usually the antenna is optimized for the specific carrier. Sorry i am not sure about it...

Hi
blackice666 said:
Im not quite sure if the LTE will work flawlessly since usually the antenna is optimized for the specific carrier. Sorry i am not sure about it...
Click to expand...
Click to collapse
Hi.
I have the same mobile and I'm trying to unlock he SIM but I couldn't. Any ideas?

Edit : never mind

What have you tried so far
Zeeking said:
Hi.
I have the same mobile and I'm trying to unlock he SIM but I couldn't. Any ideas?
Click to expand...
Click to collapse
Have you succesfully rooted your phone?
Are you s-off?

Reuters said:
Have you succesfully rooted your phone?
Are you s-off?
Click to expand...
Click to collapse
The mobile is rooted, unlocked and S-Off.
I want to be able to install any room other than sprint, in order to use it globally.

The rom dont simunlock your phone
Zeeking said:
The mobile is rooted, unlocked and S-Off.
I want to be able to install any room other than sprint, in order to use it globally.
Click to expand...
Click to collapse
This link will give you a guide to unlock your phone, changing Rom will not help.
http://forum.xda-developers.com/showthread.php?t=2718150
If that dont work:
as member maethem wrote on page 4 in the above thread (he deserves a thank you), this is what worked for me:
Try the following on you responsibility
- You should know your SPC, you can read it with CDMA Workshop or CDMA DFS Tool.
- Install QSPT (http://forum.xda-developers.com/show....php?t=2263391)
- enable diag mode ##3424#
- open QPST configuration, from port tab add your device diagnostics port.
- from start clients tab choose service programming then ok & click on read from phone.
- on system tab choose automatic for roam preferences.
- on UMTS System tab choose any for pref service domain & any band (last bottom right) for proffered band.
- click write to phone, then your device should work on GSM mode with modified HTCOMADM_SPCS.apk.

Reuters said:
This link will give you a guide to unlock your phone, changing Rom will not help.
http://forum.xda-developers.com/showthread.php?t=2718150
If that dont work:
as member maethem wrote on page 4 in the above thread (he deserves a thank you), this is what worked for me:
Try the following on you responsibility
- You should know your SPC, you can read it with CDMA Workshop or CDMA DFS Tool.
- Install QSPT (http://forum.xda-developers.com/show....php?t=2263391)
- enable diag mode ##3424#
- open QPST configuration, from port tab add your device diagnostics port.
- from start clients tab choose service programming then ok & click on read from phone.
- on system tab choose automatic for roam preferences.
- on UMTS System tab choose any for pref service domain & any band (last bottom right) for proffered band.
- click write to phone, then your device should work on GSM mode with modified HTCOMADM_SPCS.apk.
Click to expand...
Click to collapse
I will try it. Thanks. The link to Install QSPT is not working.

Try this link
Zeeking said:
I will try it. Thanks. The link to Install QSPT is not working.
Click to expand...
Click to collapse
I searched XDA and got this:
https://www.dropbox.com/sh/cgp50ytmxy3r900/nrC_XHu-Gb

Reuters said:
I searched XDA and got this:
https://www.dropbox.com/sh/cgp50ytmxy3r900/nrC_XHu-Gb
Click to expand...
Click to collapse
Thank you.

Reuters said:
This link will give you a guide to unlock your phone, changing Rom will not help.
http://forum.xda-developers.com/showthread.php?t=2718150
If that dont work:
as member maethem wrote on page 4 in the above thread (he deserves a thank you), this is what worked for me:
Try the following on you responsibility
- You should know your SPC, you can read it with CDMA Workshop or CDMA DFS Tool.
- Install QSPT (http://forum.xda-developers.com/show....php?t=2263391)
- enable diag mode ##3424#
- open QPST configuration, from port tab add your device diagnostics port.
- from start clients tab choose service programming then ok & click on read from phone.
- on system tab choose automatic for roam preferences.
- on UMTS System tab choose any for pref service domain & any band (last bottom right) for proffered band.
- click write to phone, then your device should work on GSM mode with modified HTCOMADM_SPCS.apk.
Click to expand...
Click to collapse
Thank you, this method worked for me. It took me a while to figure our my MSL, now i unlocked 2100 Mhz and my data connects upto 5 Mbps on my GSM carrier in AE.

Successfully unlocked foruse in uk. Unfortunatelynot getting data reception.attached screenshots
Sent from my 831C using XDA Free mobile app

totoakarocky said:
Successfully unlocked foruse in uk. Unfortunatelynot getting data reception.attached screenshots
Sent from my 831C using XDA Free mobile app
Click to expand...
Click to collapse
Maybe you need the correct APNs applied.

dandan2980 said:
Maybe you need the correct APNs applied.
Click to expand...
Click to collapse
done that too. issue is same.... and this pushing me hating this sexiest phone

totoakarocky said:
done that too. issue is same.... and this pushing me hating this sexiest phone
Click to expand...
Click to collapse
How about reboot phone don't touch anything in mobile network options and go directly to phone info with the 4 digit code *#*#4636#*#* go phone information and change the preferred network type just don't touch anything in the mobile network settings and see if that works.
I had done this on Verizon GPE ROM and got data working by only switching in phone information once I toggled in actual mobile settings I was screwed maybe that will work for you

What should i select there?
Sent from my 831C using XDA Free mobile app
---------- Post added at 10:45 PM ---------- Previous post was at 10:19 PM ----------
do i need to manipulate the band selection as well?
Sent from my 831C using XDA Free mobile app[/QUOTE]

totoakarocky said:
What should i select there?
Sent from my 831C using XDA Free mobile app
---------- Post added at 10:45 PM ---------- Previous post was at 10:19 PM ----------
do i need to manipulate the band selection as well?
Sent from my 831C using XDA Free mobile app
Click to expand...
Click to collapse
[/QUOTE]
You should select what ever network type you need in order for your data to work. But if you touch any of the settings in mobile network it just stops working completely. Well at least that's what happened to me but you could also try manipulating the band's that are supported in your location

please help me.
Vcek said:
Thank you, this method worked for me. It took me a while to figure our my MSL, now i unlocked 2100 Mhz and my data connects upto 5 Mbps on my GSM carrier in AE.
Click to expand...
Click to collapse
hi, please let me know how did you unlock the sim service?
im rooted and i try many times the SIM UNLOCK HELPER but when i press START it doesnt do anything.
i try the procedure posted by REUTERS BUT I DONT KNOW IF ITS WAS OK.

[Q] Need help, lost my signal by choosing USA band through *#*#4636#*#*

Hey guys, I have a sim unlocked s-off Sprint M8.
Yesterday I chose USA band accidentally through *#*#4636#*#*. I live in China, now I cannot find any signal with my WCDMA network.
I tried everything during the last 16 hours including flashing the Harman RUU, but it did not work.
Will a stock sprint radio flash solve my problem? I looked everywhere but could not find a stock radio for sprint M8:crying::crying::crying:

WaterL said:
Hey guys, I have a sim unlocked s-off Sprint M8.
Yesterday I chose USA band accidentally through *#*#4636#*#*. I live in China, now I cannot find any signal with my WCDMA network.
I tried everything during the last 16 hours including flashing the Harman RUU, but it did not work.
Will a stock sprint radio flash solve my problem? I looked everywhere but could not find a stock radio for sprint M8:crying::crying::crying:
Click to expand...
Click to collapse
Solved

How bout u include info on how it was solved incase others have this issue.

Original T said:
How bout u include info on how it was solved incase others have this issue.
Click to expand...
Click to collapse
+1
Sent from my 831C using XDA Free mobile app

WaterL said:
Hey guys, I have a sim unlocked s-off Sprint M8.
Yesterday I chose USA band accidentally through *#*#4636#*#*. I live in China, now I cannot find any signal with my WCDMA network.
I tried everything during the last 16 hours including flashing the Harman RUU, but it did not work.
Will a stock sprint radio flash solve my problem? I looked everywhere but could not find a stock radio for sprint M8:crying::crying::crying:
Click to expand...
Click to collapse
请问你是怎么处理的？我现在也卡在2G网了，怎么刷也搞不定3G的。我是普通sprint，不是哈曼版。谢谢了！

herobygeorge said:
请问你是怎么处理的？我现在也卡在2G网了，怎么刷也搞不定3G的。我是普通sprint，不是哈曼版。谢谢了！
Click to expand...
Click to collapse
Translation:
May I ask how you deal with it? I am now stuck in the 2G network, and how to brush else fails 3G. I am an ordinary sprint, not Harman edition. Thank you!

Having same problem, please tell me how you solved it? I have exact same problem
WaterL said:
Hey guys, I have a sim unlocked s-off Sprint M8.
Yesterday I chose USA band accidentally through *#*#4636#*#*. I live in China, now I cannot find any signal with my WCDMA network.
I tried everything during the last 16 hours including flashing the Harman RUU, but it did not work.
Will a stock sprint radio flash solve my problem? I looked everywhere but could not find a stock radio for sprint M8:crying::crying::crying:
Click to expand...
Click to collapse
I'm also living in China and having a same issue after changing to USA bands, please tell me how you managed to solve it?

Magnum_Enforcer said:
Translation:
May I ask how you deal with it? I am now stuck in the 2G network, and how to brush else fails 3G. I am an ordinary sprint, not Harman edition. Thank you!
Click to expand...
Click to collapse
Engr_Junaid said:
I'm also living in China and having a same issue after changing to USA bands, please tell me how you managed to solve it?
Click to expand...
Click to collapse
herobygeorge said:
请问你是怎么处理的？我现在也卡在2G网了，怎么刷也搞不定3G的。我是普通sprint，不是哈曼版。谢谢了！
Click to expand...
Click to collapse
reinaldistic said:
+1
Sent from my 831C using XDA Free mobile app
Click to expand...
Click to collapse
Original T said:
How bout u include info on how it was solved incase others have this issue.
Click to expand...
Click to collapse
Flashing RUU will slove your problem as it have stock radio settings .
I was having same problem in sprint m8 .
The process i follow
Flash sprint RUU.
Go to DIAG MODE
connect phone to dfs .
Enable all 3g bands .
HiT Thanks if SomeBody Helps you..

Unable to Sim Unlock some Sprint M8's ?

Hey there!
SO I'm just about to buy myself a M8 or Iphone 5 ( If No option ) For what I have read on this forum from yesterday seems like some Sprint M8's can't be unlocked ? The posts I read was from April maybe the Bad A$$ people might have fixed it already ? Please enlighten me on this I prefer the HTC one M8 but the second option is the Iphone 5... I've used a M7 that was ATT as my last phone I Unlocked that Via a Unlock code from a website for 15$ And I don't live in the USA I live in Sri Lanka :fingers-crossed:
Thanks in advance have a good day.

Little hope for sprint ones.
You can download a file and flash it on the bootloader via the Sim Unlock option, but as much as i know it only worked for AT&T and T Mobile. You could give it a try though but i think theres a Risk of a brick
Sent from my HTCONE using XDA Free mobile app

XxpikaachuuxX said:
Little hope for sprint ones.
You can download a file and flash it on the bootloader via the Sim Unlock option, but as much as i know it only worked for AT&T and T Mobile. You could give it a try though but i think theres a Risk of a brick
Sent from my HTCONE using XDA Free mobile app
Click to expand...
Click to collapse
I can't take that risk sadly :/ Thanks for your reply mate ! :good:

Bump ! help a bro out

I haven't heard anything about people not being able to SIM unlock the Sprint M8. The only issue I have heard about is that some cannot get S-Off without Sunshine (Which costs $25). There are several posts on this forum regarding SIM unlock. I have done it twice now and both times I was not in the US and thus not on Sprint's network. One time in Malaysia and one time in Costa Rica. The simplest is to install BadBoyz HK rom and then use the unlock method in their post. The unlock took about 5 minutes. You may need to enable other frequency bands on the phone, but that wasn't difficult either and there is a post in the general forum about how to do that.

how are you sim unlocking your sprint m8?
use bad boyz method, it works
but make sure you'r on bad boyz rom when you do the sim unlock, wont work with stock rom. after then sim unlock, you can go back to stock rom if you want to.
no need for s-off to sim unlock

Switching From Galaxy S6 cricket to at&t

I have seen the forums that its easy to shift from cricket wireless firmware to at&t but the problen is i have saw people saying that you will lose your unlocked sim or it will get relocked by the carrier as it upgrades.....is that true?
Also wanted to know if someone can post a tutorial or something like that... im currently on buildnumber g920aztuu3boj6
And im looking forward to upgrade to MM
It would be great if somone helped me out?
Sent from my SM-G920A using Tapatalk

Can someone also provide me a link for g920azauu3bjo6
Sent from my SM-G920A using Tapatalk

I's following this topic and now my Cricket's is 6.0.1, G920AUCU3CPD6
http://forum.xda-developers.com/att...ating-to-android-6-0-1-g920aucu3cpd6-t3371884

shergrief said:
I have seen the forums that its easy to shift from cricket wireless firmware to at&t but the problen is i have saw people saying that you will lose your unlocked sim or it will get relocked by the carrier as it upgrades.....is that true?
Also wanted to know if someone can post a tutorial or something like that... im currently on buildnumber g920aztuu3boj6
And im looking forward to upgrade to MM
It would be great if somone helped me out
Sent from my SM-G920A using Tapatalk
Click to expand...
Click to collapse
Link is right above....
Yes, it is easy. Only benefit to do it at this point is better android security updates in the future...right now ATT and Cricket are on same android security update.
Downfall is, I have not found a way to go back at all. You get ATT bloatware. Some of which it terrible....you also don't get OTA updates. and yes it relocks your GSM Sim unlock....(However, all you need to do to fix this is call Cricket again and get a new unlock code if you do not have the previous unlock code and reinput it.)
At this point however I would not do it, and wish I could go back.
---------- Post added at 07:14 AM ---------- Previous post was at 07:12 AM ----------
shergrief said:
I have seen the forums that its easy to shift from cricket wireless firmware to at&t but the problen is i have saw people saying that you will lose your unlocked sim or it will get relocked by the carrier as it upgrades.....is that true?
Also wanted to know if someone can post a tutorial or something like that... im currently on buildnumber g920aztuu3boj6
And im looking forward to upgrade to MM
It would be great if somone helped me out?
Sent from my SM-G920A using Tapatalk
Click to expand...
Click to collapse
ARE YOU STILL ON CRICKET? you should of gotten MM from cricket.

I didnt get the ota of mm,i flashed mm directly from odin and it works fine. thanks for your kind help
Sent from my SAMSUNG-SM-G920AZ using Tapatalk

shergrief said:
I have seen the forums that its easy to shift from cricket wireless firmware to at&t but the problen is i have saw people saying that you will lose your unlocked sim or it will get relocked by the carrier as it upgrades.....is that true?
Click to expand...
Click to collapse
Once you physically do an unlock on a Samsung S6 device(*putting another sim in and booting up the phone and inputting the code.) then the device will remain unlocked and you can flash threw odin, or backups or factory reset the phone without losing the unlock. Only way I know the lock can be re-enabled is if you do an emergency factory recovery on the phone or you have the phone serviced(in which they do an emergency factory recovery on the phone.) and I don't even know if you can force an emergency recover in Smart Switch anymore like you used to be able to do with Kies.