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I'm running the overcome jupiter rom on my p1000 with an AT&T sim. I've tried the jk3, jpz, and i9000 modems and none seem to allow me to use data or voice. I'm a little new to this and just wondering what else I should try. Thanks for the help.
Can the international tab receive an at&t signal?
Im on the jp4 modem now and im getting edge but no 3g, one step closer but its too slow...any ideas?
You need to reflash the at&t modem.bin file...
captivatingtab said:
I'm running the overcome jupiter rom on my p1000 with an AT&T sim. I've tried the jk3, jpz, and i9000 modems and none seem to allow me to use data or voice. I'm a little new to this and just wondering what else I should try. Thanks for the help.
Click to expand...
Click to collapse
What apn setting are you using?
It should be wap.cingular.com
From the searching I've done it seems like I have the right apn settings.
Sent from my GT-P1000 using XDA App
Is your wireless mode set to auto?
Yes it is.
I have tried every one of the modems in the modem thread, ive reflashed overcome multiple times with both the at&t modem the international modems listed in the install guide and I still cant get my tab to work on 3g....sometimes i get edge but never 3g....what am i doing wrong?
and im using my at&t sim card(that works flawlessly in my captivate) in an international tab with the gt-p1000 model number and the white back
To use at&t 3g signal you need to be on the 1900mhz band, and 850mhz band. Check the built - in capabilities of your tab (google).
What are the first few lines in the APN settings please.
For the wireless mode, what happens if you set it to wcdma only (no signal, I'm guessing).
Is packet data checked?
rangercaptain said:
To use at&t 3g signal you need to be on the 1900mhz band, and 850mhz band. Check the built - in capabilities of your tab (google).
What are the first few lines in the APN settings please.
For the wireless mode, what happens if you set it to wcdma only (no signal, I'm guessing).
Is packet data checked?
Click to expand...
Click to collapse
packet data is checked and from my understanding the international tab(model gt-p1000) is capable of at&t 3g
and my APN settings are:
Name:
ATT
APN:
wap.cingular
Proxy:
Not Set
Port:
Not Set
User name:
WAP.CINGULARGPRS.COM
Password:
Not Set
Server:
Not Set
MMSC
http://mmsc.cingular.com
MMS proxy:
wireless.cingular.com
MMS port:
80
MCC:
310
MNC:
410
Authentication type:
Not Set
APN type:
internet + mms
and you are correct about the network mode
Ok, this is the last thing I know to try.
On the dialpad *#2263#
tap [2]WCDMA BAND
Tap[3]WDCMA 1900
tap Select WDCMA _W1900 only
An astresk should be in the bracket now.
Tap the menu button, select back
Tap menu button, select end
You are back at the dialpad.
Did the E (EDGE) change to 3G or H?
I flashed JMA on my SGH-I987 and it now reads GT-P1000. My APN is set to:Broadband, and I have no username set per the original settings I had before I flashed. It wouldn't connect before I set that post flash. Now My 3G status icon switches between 3G and H but connects.
hope this helps.
theBOZman said:
I flashed JMA on my SGH-I987 and it now reads GT-P1000. My APN is set to:Broadband, and I have no username set per the original settings I had before I flashed. It wouldn't connect before I set that post flash. Now My 3G status icon switches between 3G and H but connects.
hope this helps.
Click to expand...
Click to collapse
Are you using the sim that came with the tab, or one borrowed from another phpne? Because the "Broadband" apn is for the sim that came with the tab. Wap.cingular is for borrowed sim cards.
Im using the one that came with the tab. thanks for the update about the difference!
Pulled from the Inspire forums and can confirm working mod.
PROCEDURE FOR ROMS WITH A SINGLE LOCKED APN:
If your APN is locked (it shows the lock symbol and you cannot change the settings), then we're just going to add a second one.
From the APN screen, press Menu>>New APN. Here are the settings for your 2nd APN. Everything is case sensitive and must be entered exactly as below.
Name: Media Net (if your 1st locked APN is named Media Net, then just name this one Media Net2 - this name in this field isn't important as long as it's unique)
APN: Phone
MMS protocol: WAP 2.0 (this option might not be in your APN, so don't worry if you don't see it)
MCC: xxx (Don't change this number)
MNC: xxx (Don't change this number)
APN type: default,admin,hipri (notice there are no spaces between the words and the commas)
APN protocol (if applicable): IPv4
Everything else: <Not set>
Once you have the above settings entered, press menu and save. You will exit back out to the APN selection screen. Now you need to select the little round button for the new APN (Media Net/Phone) that you just created. Your phone's data connection will drop for several seconds as it switches to the new APN, and then come back. If you find that your connection doesn't "stick" on the 2nd APN (i.e. the selection button keeps reverting back to the 1st APN) then reboot your phone and try selecting the 2nd APN again.[/COLOR][/B] It is mandatory that the 2nd APN is selected in order for the speed benefit.
We're done. If something went wrong and you need to revert back to your default APN config, from the APN selection screen just press menu and select "Reset to default".
Will this allow tethering without the tethering plan?
Thanks I can confirm it works great no need to root my phone now
Sent from my HTC PH39100 using xda premium
geek_riot said:
Will this allow tethering without the tethering plan?
Click to expand...
Click to collapse
Correct. I am on a $30 Unlimited LTE data plan no tethering but have it enabled with this mod.
Noodles5666 said:
Correct. I am on a $30 Unlimited LTE data plan no tethering but have it enabled with this mod.
Click to expand...
Click to collapse
Awesome!! Thanks!!
Even better it drops us off of LTE, i.e. we can now turn the darn thing off and save some battery
This doesnt let you use LTE 4g while doing tetherning. After adding this apn it kicks you to the HSPA+ 4g.
But this is an easy way to create an easy way to switch between LTE and HSPA+
Edit: also it didnt allow me to do tethering. Said i had to dial 611 and get it added.
I seem to be doing something wrong... I made the second APN and activated it. When I try to use the WiFi Hotspot App, I get a message about adding tethering. Should I be using a different app?
jason.hamilton said:
This doesnt let you use LTE 4g while doing tetherning. After adding this apn it kicks you to the HSPA+ 4g.
But this is an easy way to create an easy way to switch between LTE and HSPA+
Click to expand...
Click to collapse
This may be but my internet icon has not changed. Showing 4G but that is probably due to the market I am in is not an LTE market.
Noodles5666 said:
This may be but my internet icon has not changed. Showing 4G but that is probably due to the market I am in is not an LTE market.
Click to expand...
Click to collapse
Yea when you are on the 4g LTE network, there is a little LTE underneath the 4g symbol
geek_riot said:
I seem to be doing something wrong... I made the second APN and activated it. When I try to use the WiFi Hotspot App, I get a message about adding tethering. Should I be using a different app?
Click to expand...
Click to collapse
Have you followed step by step? Yes? Then have you tried rebooting the phone?
Is there any way you can update that APN to work with LTE 4g.
jason.hamilton said:
Is there any way you can update that APN to work with LTE 4g.
Click to expand...
Click to collapse
Sorry as of now I don't have a way. Will be figuring that out shortly.
Does not work for me.
Followed steps and reboot. No good.
Not Working
It works for a second and then it reverts back to that you need a tethering plan. Any other info. Thanks
z45123 said:
It works for a second and then it reverts back to that you need a tethering plan. Any other info. Thanks
Click to expand...
Click to collapse
I've ran it for about 2 gigs today and had no issues. Also once you turn it off the next time you wanna do it you will have to switch back to the stock APN and then back to the one you made. It's not perfect but it's better than nothing right now.
I didn't use these settings to enable tethering, but I entered them just to get ANY sort of data connection. It definitely solved my issues. Thanks a lot!
Won't revert to default
I set up an apn for hspa+ before I could get a 4g sim. I've switched sims and now I wanted to go back to default and it said I had no data due to an apn error. The radial box is selected for the original apn.
It would work for a second and my laptop would see the network but quickly went back to telling me to go to AT&T and get a tethering plan. However Having the second APN seems to help when the data gets flaky, which is VERY often. Speeds are erratic and I often can't get ANY data.
Sentinel
would love to see this work with the LTE connection.
So it seems like a lot of people are having trouble getting 4G speeds with AT&T. After a couple days of back and forth with sales reps and tech support, I think I have it figured out. I'll try to make this an easy to follow guide.
Getting the Right Data Plan
First thing's first, you need to have a 4G data plan. To check which data plan you currently have, you can log into your account on http://www.att.com. After logging in, mouse-over the "Wireless" tab at the top and click "Add or Change Services." From here, you can scroll down and view the "Web, Text & More" section. This is what mine looks like.
Your data plan has to be a 4G Smartphone plan. If you are coming from a previous 4G phone, and you just popped in your old sim card WITHOUT calling AT&T, you should be all set and you can skip to the next section. However, if you DID call AT&T to give them your Nexus 4's IMEI, your data plan will default to "3G for Blackberry" or something similar. This is because the Nexus 4's IMEI isn't appropriated as a 4G smartphone in AT&T's system.
You have a couple options at this point. You can try to contact AT&T, explain it to them, and hope they give you a correctly provisioned data plan. This can be a quick and simple fix, and has worked for some people. However, it didn't work for me. After speaking with customer service over live chat, tech support over the phone, and going into both an authorized retailer and a corporate store, I was told that they can only provide 4G plans to AT&T branded 4G phones.
The solution to this is to give AT&T the IMEI number from one of their 4G phones. (NOTE: The only thing the IMEI does is tell them what type of phone it is, and what plans can be assigned to it. IT IS NOT LIKE A SERIAL NUMBER, AND AT&T WILL NOT CHECK TO MAKE SURE IT IS UNIQUE.) Find a friend with an AT&T 4G phone and note the IMEI number. You can quickly pull it up by typing *#06#. Then you can call AT&T customer service, tell them you have a new smartphone that you would like to get the correct data plan for, and give them the IMEI number you just copied down. (I told them I have an LG Optimus G, which isn't too far off I suppose )
Now you should have a 4G data plan.
Setting the APN
After you confirm that you have a 4G data plan, you have to set the correct APN. To get into the APN settings, go into your android settings, under "Wireless & Networks" go into More>Mobile Networks>Access Point Names. You can either select the menu button and create a New APN, or you can select the one already there and edit it to match the one below.
Code:
APN Settings:
Name: AT&T HSPA+
APN: pta [COLOR="Red"](NOTE: IF YOU DON'T HAVE AN LTE PLAN, CHANGE THIS TO "PHONE")[/COLOR]
Proxy: Not set
Port: Not set
Username: Not set
Password: Not set
MMSC: http://mmsc.mobile.att.net
MMS Proxy: proxy.mobile.att.net
MMS port: 80 [COLOR="Red"](NOTE: IF MMS ISN'T WORKING, CHANGE THIS TO "8080")[/COLOR]
MCC: 310
MNC 410
Authentication type: Not set
APN type: default,admin,fota,mms,supl,hipri
APN protocol: IPv4/IPv6
APN roaming protocol: IPv4/IPv6
Bearer: Unspecified
Be sure to hit the menu button and save the APN, then select it in APN settings. If at this point you fail to get a connection, you most likely don't have a 4G data plan and should go through the steps in the first section.
Enabling LTE
This part is optional, but I see no harm in doing it. Type *#*#4636#*#* into your phone. This should open up a "Testing" settings screen. Go into Phone Information, scroll down to "Set preferred network type:" and select "LTE/GSM/CDMA auto (PRL)" from the drop-down menu. If you happen to be in an area with AT&T band 4 LTE, you will be able to connect to it. According to this thread, AT&T has band 4 LTE in the Oklahoma City area. If anyone else can confirm any other areas, maybe we can get an idea of how widespread it is.
Hopefully this has helped some people. Let me know if there are any inaccuracies or changes that should be made.
Does it have to be 4G LTE? Mine just says the same thing, but 4G. They set it up in the store, as well, but they set it up as my old SGS2, which has 4G, but not LTE.
I have galaxy s3 with LTE data plan so so when I get my nexus , I just need to set up apn . Thats it right.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
yahoowizard said:
Does it have to be 4G LTE? Mine just says the same thing, but 4G. They set it up in the store, as well, but they set it up as my old SGS2, which has 4G, but not LTE.
Click to expand...
Click to collapse
No, it doesn't have to be LTE. You should still be able to connect to the HSPA+ network. You only need the LTE plan if you want to try to connect to the band 4 LTE network in the few areas AT&T has it.
So what are the speeds with this?
I do want the LTE network, so I guess I should call and get that changed. However, nothing works at all, no data, no HSPA, nothing. I guess 4G plan isn't valid.
NO LTE in St. Louis
adi_scorpios said:
I have galaxy s3 with LTE data plan so so when I get my nexus , I just need to set up apn . Thats it right.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
Click to expand...
Click to collapse
Right, all you would have to do is put the sim card from your GS3 into your Nexus 4. It should set the APN automatically since it's already a 4G plan, but you can always double check.
BennyJr said:
So what are the speeds with this?
Click to expand...
Click to collapse
This would depend a lot on your area. I seem to be getting 8-10 Mbps in a HSPA+15 coverage area.
grandfathered
Dose anyone know if this will negatively affect a data plan that is grandfathered unlimited. I don't want them to mess that up.
yahoowizard said:
I do want the LTE network, so I guess I should call and get that changed. However, nothing works at all, no data, no HSPA, nothing. I guess 4G plan isn't valid.
Click to expand...
Click to collapse
Try changing the APN setting from "pta" to "phone". I believe pta is the setting for the LTE plan, and phone is the setting for the regular 4G.
VanVlack said:
Dose anyone know if this will negatively affect a data plan that is grandfathered unlimited. I don't want them to mess that up.
Click to expand...
Click to collapse
I think you only stay grandfathered unlimited if you don't change your plan at all. I have the 2GB plan that is no longer available, and on the "Add or Change Services" page it tells me that if I make any changes I won't be able to revert to my current 2GB plan. I would assume it's the same for all discontinued plans.
i have grandfathered unlimited data from an old iphone 3gs plan...here is what it says on att's website:
Data Unlimited SmartPhone Personal
Data Plan for SmartPhones. Unlimited domestic data usage. Only available for upgrades. Requires customers to be on a "Gold List" Data Unlimited SmartPhone Plan prior to upgrade to 4G device.
so is this considered "4G"? i live outside of philly and the fastest i've ever gotten on speedtest was around 6 mbits/sec...99.9% of the time it's between 1 and 3 (this is on my galaxy s 2).
ppeklak said:
i have grandfathered unlimited data from an old iphone 3gs plan...here is what it says on att's website:
Data Unlimited SmartPhone Personal
Data Plan for SmartPhones. Unlimited domestic data usage. Only available for upgrades. Requires customers to be on a "Gold List" Data Unlimited SmartPhone Plan prior to upgrade to 4G device.
so is this considered "4G"? i live outside of philly and the fastest i've ever gotten on speedtest was around 6 mbits/sec...99.9% of the time it's between 1 and 3 (this is on my galaxy s 2).
Click to expand...
Click to collapse
As far as I know, they label all the 4G plans as such. What are your APN settings? If it's wap.cingular, I'm pretty sure that's 3G.
smalovic said:
As far as I know, they label all the 4G plans as such. What are your APN settings? If it's wap.cingular, I'm pretty sure that's 3G.
Click to expand...
Click to collapse
Mostly correct -- I was under the belief the wap.cingular isn't able to achieve HSPA+ speeds (I was only able to get 1mbit up and down). Someone else in a different thread told me that they were connecting at HSPA+ speeds on wap.cingular. So it turns out APN's alone aren't directly indicative of what plan you have. However, being able to connect on either "phone" or "pta" APNs is pretty much a guarantee your plan is provisioned correctly as those are the APN's used for HSPA+ as well as LTE.
Here's my exact post from the other thread : http://forum.xda-developers.com/showpost.php?p=34778373&postcount=19
Also an in-depth APN rundown here : http://forum.xda-developers.com/showpost.php?p=34824948&postcount=116
smalovic said:
The only thing the IMEI does is tell them what type of phone it is, and what plans can be assigned to it. IT IS NOT LIKE A SERIAL NUMBER, AND AT&T WILL NOT CHECK TO MAKE SURE IT IS UNIQUE.
Click to expand...
Click to collapse
It may well be true that AT&T don't check that an IMEI is unique, but actually it IS a unique serial number ....
smalovic said:
So it seems like a lot of people are having trouble getting 4G speeds with AT&T. After a couple days of back and forth with sales reps and tech support, I think I have it figured out. I'll try to make this an easy to follow guide.
Click to expand...
Click to collapse
So far only updated the APN, and I was on the wap.cingular, with a grandfathered data plan. My Speedtest results after the APN change is now DOUBLE my wifi connection speed via DSL. I'm outside city limits South of Holland, MI, and getting 7-9Mbps now. I can't wait to go up to Grand Rapids where I know ATT has a very robust 4G network and see what I get there.
So would LTE on AT&T work with the non-smartphone unlimited data plan?
Does AT&T even pick up the nexus 4 as a "smartphone"?
Thanks
4ktvs said:
So would LTE on AT&T work with the non-smartphone unlimited data plan?
Does AT&T even pick up the nexus 4 as a "smartphone"?
Thanks
Click to expand...
Click to collapse
It appears some people who are in AT&T LTE coverage where AT&T does not have 700MHz licenses are getting LTE over the AWS frequencies (the same ones used in Canada). The Nexus 4 only appears to have LTE operable on AWS. There's more about it in this thread : http://forum.xda-developers.com/showthread.php?t=2021173
It's unlikely LTE would work with the non-smartphone data plan as those require the "pta" APN, which is only accessible on LTE plans.
Atlanta here.
I double checked to make sure I had my settings right, according to the OP.
I'm not getting the LTE symbol in the status bar (only H) and getting 8-10 MBPS down according to the speed test.
I assume that's still HSPA+ for the Atlanta downtown area. (By GA tech)
AT&T iPhone 4S SD Chip to N4 - 4G Compatible?
I am switching over from an iPhone 4S to the N4 and cannot get 4G data speeds (actually the best I can get is sub 2mb/sec). My old APN was wap.cingular and I beleive I was only getting 3G data with the iPhone; however, at some point AT&T started calling my service 4G and that is what would show up on the phone. Can anyone confirm that the iPhone 4S to N4 switch will require me to take the IMEI route to get the AT&T 4G speeds. Thanks for the help.
Awesome IFL
I have a Samsung Ativ S t899M (rogers) Win8 ohone. I am in Las Vegas and trying to get the LTE to work, I can see it I get 4 bars LTE but no connection, I have added fast.t-mobile.com in the internet apn, I downloaded the samsung apn and tried setting it there. Nothing. No data connection.
Odd think is when I Downloaded the Samsung APN tool I see Verizon - LTE Internet greyed out..
(and if I add in the apn for t-mobile i then get the option to reset to default. SO I am guessing I need to get rid of that Verizon LTE setting all together. Any ideas? Is there some menu I have to go into or eng code I have to plug in?
glenroebuck said:
I have a Samsung Ativ S t899M (rogers) Win8 ohone. I am in Las Vegas and trying to get the LTE to work, I can see it I get 4 bars LTE but no connection, I have added fast.t-mobile.com in the internet apn, I downloaded the samsung apn and tried setting it there. Nothing. No data connection.
Odd think is when I Downloaded the Samsung APN tool I see Verizon - LTE Internet greyed out..
(and if I add in the apn for t-mobile i then get the option to reset to default. SO I am guessing I need to get rid of that Verizon LTE setting all together. Any ideas? Is there some menu I have to go into or eng code I have to plug in?
Click to expand...
Click to collapse
nevermind I figured it out - had to delete all the information in both apn and internet settings then created the tmobile - lte in the added samsung apn app and nothing else..just that and it all works not. getting 18 down and 18 up!!
I had to also change the mode to IPv4 only - I lost connection as soon as I put it on IPv4v6.
So I recently bought a new Galaxy Note 3 T-mobile variant on craigslist to use on my AT&T plan. The phone is perfect, I love it! The only problem is that I can't seem to connect to LTE after I unlocked it. I have already rooted the phone using CF Auto-root, and then I turned to unlocking it. I heard that the "Region Lock Away" app by chainfire removed the region lock as well as unlocked the sim, as long as you reboot later. So thats what I tried first rather then pay for an unlock code.
Now when I bought the Note 3, it didn't include the sim card from T-mobile. So I did the whole process of rooting and unlocking under my real att sim card that I was using with my Nokia lumia 920 (I know it was time to upgrade). I went to an ATT retail store, and I ended up talking to a service rep and explained that I wanted to use my Galaxy note 3 on their network, and that I would be unlocking it when I got home. She convinced me to give them the IMEI number on the back of the phone to "provision the network to my phone".
Well after the Region Lock Away app did it's thing, I no longer had the sim card ask for an unlock code and I was able to text and make calls. So I figure that I was fully unlocked. But my data wasn't working, so after a bit of research here at XDA I noticed that I needed to change my apn settings. So i used these as suggested by another post:
NAME: ATT Phone
APN: phone
MMSC: http[colon]//mmsc.mobile.att[dot]net <-- XDA thinks I am posting a url!
MMS proxy: proxy.mobile.att[dot]net
MMS port: 80
MCC: 310
MNC: 410
APN type: default,mms,supl,hipri
After setting these, and then using them, I can't find any data connection at all. Can anyone shed some insight as to what may be the problem?
BTW: the legacy wap.cingular apn settings are working for me but I only get about 2 Mb/s max. Which is not what I want from an LTE phone obviously.
The only thing I noticed you did not mention is "authentication type", which needs to be manually set to None. I come to the note 3 from an AT&T galaxy s4. I was using a t-mobile custom rom on it the whole time, every time I reset the ROM I had to manually add APN settings, authentication type "none" always had to be selected along with the rest of the entries. If you don't manually set this it will read "not set".
Sent from my SAMSUNG-SM-N900A using XDA Premium 4 mobile app
Settings are right as I compared them with my phone. Only thing I can think of is the rep didn't configure your account right and LTE is not enabled. You can log onto your att.com and check to see if your sim has LTE activated. You would see something like DataPro 3GB for Smartphone 4G LTE or whatever amount of data checked on your line. If not your LTE is not active it won't work no matter what APN settings you use.
Edit; this is what authentication type should read instead of default "not set".
Sent from my SAMSUNG-SM-N900A using XDA Premium 4 mobile app
Thanks for the replies!! Well I went in to the att store, and spoke with the same person who switched my IMEI number into the system. Looks like two things happened, first my data plan was switched from a 3GB LTE data to a media plan which was causing me to recieve text messages complaining about my data usage and stating $200 charges. To remedy this we had to make a call to the dreaded at&t customer service center where my Rep. was put on hold for about 30 min (ridiculous...) and also the charges were removed. I also had her switch the IMEI to the Galaxy S3 that I previously used before I got the sudden death ****. So after all that, my data has finally connected and im getting about 7MB down which is still only HSPA+. So the only thing I have left to try is maybe some other APN settings (suggestions here????) or maybe try a new simcard and use the unlock code I have.
melead said:
Thanks for the replies!! Well I went in to the att store, and spoke with the same person who switched my IMEI number into the system. Looks like two things happened, first my data plan was switched from a 3GB LTE data to a media plan which was causing me to recieve text messages complaining about my data usage and stating $200 charges. To remedy this we had to make a call to the dreaded at&t customer service center where my Rep. was put on hold for about 30 min (ridiculous...) and also the charges were removed. I also had her switch the IMEI to the Galaxy S3 that I previously used before I got the sudden death ****. So after all that, my data has finally connected and im getting about 7MB down which is still only HSPA+. So the only thing I have left to try is maybe some other APN settings (suggestions here????) or maybe try a new simcard and use the unlock code I have.
Click to expand...
Click to collapse
Searching for the AT&T APN setting led me to this thread.
After setting all the APN settings as others, I was still getting pretty slow connection speed.
Then, I switched the Bearer to "LTE" type and voila! I started getting the full LTE speed!
ArborRes said:
Searching for the AT&T APN setting led me to this thread.
After setting all the APN settings as others, I was still getting pretty slow connection speed.
Then, I switched the Bearer to "LTE" type and voila! I started getting the full LTE speed!
Click to expand...
Click to collapse
You can only do this if you know your in a LTE supported area otherwise you will not get any data if your in a 4g or H+ area with the bearer set to LTE only.
wrong thread
These are my new working APN settings. 4G LTE completely working on AT&T
Name: ATT Phone
APN: phone
proxy through server:not set
MMSC: http[colon]//mmsc[dot]mobile.att.net
Multimedia Message Proxy: proxy.mobile.att.net
multimedia message port: 80
MCC: 310
MNC: 410
Authentication type: not set
APN Type: default,mms,supl,hipri,fota
APN protocol: IPv4
APN Roaming Protocol: IPv4
Bearer: Unspecified
Mobile virtual network operator type:not set
I find that no matter what settings I use on the APN (working ones, I mean), if I have Wifi on, I lose LTE. As soon as I disable Wifi, even if I don't move the phone, LTE comes back. Not that it matters, I just like seeing that little 4G LTE icon.
My guess is that your WiFi is set to take priority over mobile data. There might be a setting to change this though. For example in the WiFi settings there is a toggle that allows your phone to automatically switch between WiFi and mobile data, to have a seamless browsing experience.
I'm on lollipop running the Echoe ROM on my sm-n900t and I use the download booster to boost my speeds by using both together.