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  1. AR2186's Avatar
    Confirmed by others to be working on RM-940 w/ Cyan and/or Denim updates. This trick enables the 1700mhz band 4 for HSPA+ for use on carriers including T-Mobile in the US and Wind/Mobilicity in Canada. Functionally we now have the equivalent of RM-938 but with 16gb and the benefit of a US warranty, but lacking Qi charging

    Phone Information
    AT&T Nokia Lumia 1520 (SIM unlocked)
    Windows Phone 8.10.12397.895 (Cyan) or 8.10.14219.341 (Denim)
    Firmware Revision: 02061.00074.14273.33019 (Cyan) or 02540.00019.14484.37028 (Denim)
    Hardware Revision: 4.1.0.0
    Radio Software Version: 201c110.00024.0001 (Cyan) or 201c110.00039.0001 (Denim)

    extra-info.jpg

    Step 1: Go to the dialer and dial ##3282# (no need to press send, the final "#" will automatically take you to the next step. Picture is edited to represent what needs to be input)

    step01.jpg

    Step 2: Accept the disclaimer and enter Field Test

    step02.jpg step03.jpg

    Step 3: Click on the ellipse on the lower right to bring up the Settings link

    step04.jpg

    Step 4: Change Network Type from Automatic to Manual. You should now see a "Supported Bands" list populate reporting "13/14 bands active"

    step05.jpg step06.jpg

    Step 5: Enter the band sector and scroll down to "B4-WCDMA US 1700" and click the check mark. Make sure to then hit the check mark at the bottom to save the settings.

    step07.jpg

    Step 6: Make Sure that Supported Bands now reads "all bands active"

    step08.jpg
    Last edited by AR2186; 03-09-2015 at 08:46 AM.
    12-03-2014 10:49 AM
  2. HoosierDaddy's Avatar
    If this works, that will be awesome.

    I don't use Qi so might prefer an AT&T over my 1520.3. Basically then its a trade off between 32GB and having a US warranty Since I put all files on SD and just apps on the phone, I think 16GB might be enough. And if not, isn't there a 32 GB AT&T 1520?
    12-03-2014 02:35 PM
  3. AR2186's Avatar
    I believe there is a 32gb version of the AT&T 1520, but I'm not sure it's actively being sold / may have been a limited run. I'm curious if the ability to connect to the 1700 band is because I have hardware revision 4.1 (assuming it started as 1.0?). The phone came with Cyan out of the box
    RumoredNow likes this.
    12-03-2014 02:51 PM
  4. tai4de2's Avatar
    In that same app there is a way to look at the channel being used to connect to the cell tower. I no longer have any phones that include that app so can't refresh my memory on *exactly* how do to it.

    However if you go into "WCDMA" menu on the top page, you can drill around until you see something like AFRCN as shown on this page:

    http://forums.windowscentral.com/win...nal-arfcn.html

    Then look that up in the channel list here in one of the UARFCN columns:

    UMTS frequency bands - Wikipedia, the free encyclopedia
    12-03-2014 08:15 PM
  5. AR2186's Avatar
    In that same app there is a way to look at the channel being used to connect to the cell tower. I no longer have any phones that include that app so can't refresh my memory on *exactly* how do to it.

    However if you go into "WCDMA" menu on the top page, you can drill around until you see something like AFRCN as shown on this page:

    http://forums.windowscentral.com/win...nal-arfcn.html

    Then look that up in the channel list here in one of the UARFCN columns:

    UMTS frequency bands - Wikipedia, the free encyclopedia
    Thanks. Looks like I am getting UARFCN readings of 462 and 2062, which appears to be the PCS 1900 and 1700 bands, respectively. Guess that proves it works
    12-05-2014 12:36 AM
  6. Liam Wong's Avatar
    Have any of you tried it on the green Lumia 1520? Really wanted a green one to use on Wind in Canada.
    12-05-2014 02:19 PM
  7. Donny James's Avatar
    Man I was wondering if Windows Phone could do anything like this just a few months ago. Back then I stumbled upon a video on YouTube of a guy doing something similar like this on Samsung Galaxy Note 3. He pretty much enabled all LTE, 4G etc bands ever created by mankind. It was awesome. Now you found this and it has made my day. It seems to have made 4G connection much better indoors. I've never seen 3G on my L1520 on T-Mobile. Hopefully this has enabled it. RM-940
    Last edited by Donny James; 12-08-2014 at 09:47 AM.
    12-05-2014 02:42 PM
  8. AR2186's Avatar
    Have any of you tried it on the green Lumia 1520? Really wanted a green one to use on Wind in Canada.
    No I only have a white 16gb. Do you know what hardware version it is? Also, if people can try this and list their model it would be helpful to understand if all AT&T 1520s have this capability
    RumoredNow likes this.
    12-06-2014 12:19 PM
  9. RumoredNow's Avatar
    I'd help test, but I'm on a 1520.3. It already has WCDMA 1700 enabled and the ##3282# field test menu is disabled... Sorry.

    I do think this is a VERY worthwhile project though and I hope some users step forward to help test. I'm avidly reading this thread as I'm always interested in radio/carrier match ups.
    12-06-2014 02:43 PM
  10. HoosierDaddy's Avatar
    Have any of you tried it on the green Lumia 1520? Really wanted a green one to use on Wind in Canada.
    The color shouldn't matter. The model number does. But if the green happens to be a different model number than all the rest, that would be what makes the difference. I think all the 16GB AT&Ts have the same model number.
    RumoredNow likes this.
    12-06-2014 02:47 PM
  11. AR2186's Avatar
    I'd help test, but I'm on a 1520.3. It already has WCDMA 1700 enabled and the ##3282# field test menu is disabled... Sorry.

    I do think this is a VERY worthwhile project though and I hope some users step forward to help test. I'm avidly reading this thread as I'm always interested in radio/carrier match ups.
    Mind posting your hardware/software info? Also how many bands does your 1520 have (LTE, WCDMA, etc)?
    12-06-2014 02:47 PM
  12. RumoredNow's Avatar
    The color doesn't determine. The model number does. But if the green happens to be a different model number than all the rest, that would be what makes the difference. I think all the 16GB AT&Ts have the same model number.
    I didn't want to tell them the green model is just a sheep in "Hulk" clothing...
    12-06-2014 02:48 PM
  13. AR2186's Avatar
    I didn't want to tell them the green model is just a sheep in "Hulk" clothing...
    I realize that, but the green came out in 2014 with a limited hardware run, so it may not come from the original hardware version. My 1520 (2 weeks old w/ Cyan out of the box) is Hardware Revision number 4.1.0, but still RM-940. Its not unheard of for hardware changes within the same model as problems are discovered. The 1520 originally only supported 4 WCDMA/UMTS/HSPA bands with the FCC, but mine has 5. Could be hardware (radio disabled on old ones) or it could be software. The real question is determining which rm-940 hardware revisions have access to the band in ##3282# field test mode. Hopefully its all of them, but we can't be certain yet and I don't want to get peoples hopes up

    Edit: Thought you were replying to me for some reason, but my point still stands
    12-06-2014 02:54 PM
  14. HoosierDaddy's Avatar
    No field test with my 1520.3 either.

    I thought I read in this or another thread where a 1520.3 owner did this and changed some things for the better?!?
    12-06-2014 02:55 PM
  15. Liam Wong's Avatar
    The color shouldn't matter. The model number does. But if the green happens to be a different model number than all the rest, that would be what makes the difference. I think all the 16GB AT&Ts have the same model number.
    Well I was assuming that since the green version came out later it might have a different hardware revision number than what the OP has. It would be interesting to see if it worked on all At&t 1520s regardless of when it came out.
    12-06-2014 02:56 PM
  16. AR2186's Avatar
    I'd help test, but I'm on a 1520.3. It already has WCDMA 1700 enabled and the ##3282# field test menu is disabled... Sorry.

    I do think this is a VERY worthwhile project though and I hope some users step forward to help test. I'm avidly reading this thread as I'm always interested in radio/carrier match ups.
    There may be other ways to enable field test. Try *3001#12345# or *3001#12345#*
    12-06-2014 02:57 PM
  17. HoosierDaddy's Avatar
    I realize that, but the green came out in 2014 with a limited hardware run, so it may not come from the original hardware version. My 1520 (2 weeks old w/ Cyan out of the box) is Hardware Revision number 4.1.0, but still RM-940. Its not unheard of for hardware changes within the same model as problems are discovered. The 1520 originally only supported 4 WCDMA/UMTS/HSPA bands with the FCC, but mine has 5. Could be hardware (radio disabled on old ones) or it could be software. The real question is determining which rm-940 hardware revisions have access to the band in ##3282# field test mode. Hopefully its all of them, but we can't be certain yet and I don't want to get peoples hopes up
    It's still not determined by color. There is nothing preventing a hardware change between the first of any color and the last of that color, including green, no matter how short of time passed between them.
    12-06-2014 02:58 PM
  18. AR2186's Avatar
    It's still not determined by color. There is nothing preventing a hardware change between the first of any color and the last of that color, including green, no matter how short of time passed between them.
    Yeah I know, not really what I was saying, only that its probably a different production run, and there appear to be different hardware versions in 2014 so who knows. Hopefully its the same as mine and works
    12-06-2014 03:10 PM
  19. RumoredNow's Avatar
    Mind posting your hardware/software info? Also how many bands does your 1520 have (LTE, WCDMA, etc)?
    Well I can't get into field test to screencap that but all documentation shows:
    • GSM 850/900/1800/1900 (same across all variants)
    • HSDPA 850/900/1700/1900/2100 (this would be the WCDMA module)
    • LTE 700/850/1700/1900/2100/2600 Bands 2, 4, 5, 7, 17 (same LTE radio as RM-940)


    wp_ss_20141206_0001.jpg
    12-06-2014 03:12 PM
  20. Donny James's Avatar
    Well I still haven't seen 3G on AT&T RM-940 L1520. I never did change the APN setting when I brought my phone to T-Mobile. Should I have done that to get 3G? I already get Edge, 4G and 4g LTE. Don't know if I should mess with it.
    12-08-2014 09:55 AM
  21. AR2186's Avatar
    Well I still haven't seen 3G on AT&T RM-940 L1520. I never did change the APN setting when I brought my phone to T-Mobile. Should I have done that to get 3G? I already get Edge, 4G and 4g LTE. Don't know if I should mess with it.
    They identify any HSPA+ connection as "4G" even though it is faster "3G". Actually, LTE is technically 3.5G so its all just marketing.

    You should definitely try to turn on the 1700mhz band as I explained. Let us know if you have success
    12-08-2014 10:04 AM
  22. Donny James's Avatar
    I enabled 1700mhz as you explained. Oh and thanks again. The only thing I noticed different was a strong 4G connection. Meaning where I would normally have Edge I now have 4G.
    RumoredNow likes this.
    12-08-2014 11:07 AM
  23. RumoredNow's Avatar
    Yep... If there is no T-Mo LTE in an area of towers, then it has H+ on that 1700 WCDMA... If you don't have your 3G 1700 on it falls to EDGE on 1900 via 2G radio.
    Donny James likes this.
    12-08-2014 02:50 PM
  24. Donny James's Avatar
    Since we're talking about T-Mo and signals. Is it just me, or does T-Mo's signal fluctuate from LTE to EDGE and back continuously for you guys too, even though you remain in the same spot?
    12-09-2014 09:09 AM
  25. RumoredNow's Avatar
    Since we're talking about T-Mo and signals. Is it just me, or does T-Mo's signal fluctuate from LTE to EDGE and back continuously for you guys too, even though you remain in the same spot?
    That happens to me in one area... I also know for a fact that I'm roaming on an AT&T Tower when it acts like this. (It's the only tower around, quite literally, for miles.)
    12-09-2014 09:13 AM
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