Galaxy SIII w/ CM10 - LTE?

So I'm running CM10 on my Galaxy SIII and so far it has been fantastic. This past weekend I was visiting family in an area that actually has LTE coverage and I couldn't get it to connect. Has anyone else run into this?

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21 comments
  • not seeing any complaints about LTE not working on CM10.

    Are you using CM10 M2?

    Did you do all these when flashing the ROM?

    Full factory reset

    Wipe cache partition

    Wipe Dalvik

    Flash ROM

    Flash gapps

    Wipe cache partition

    Wipe Dalvik

    Reboot  

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  • also, did you make sure you had LTE/CDMA set in the preferred network mode under mobile networks/Network mode?

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  • I hadn't seen any complaints about it either.

    I'm running a CM nightly.

    Did all the flashing steps.

    Set LTE/CDMA as preferred network mode (and made a large number of other changes that looked like it may be related).

    Unfortunately, I won't get to play with it again until Christmas.

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  • Scratching my head, could be a bad flash.

    I might try flashing the ROM again, or the newer CM10 M2. Supposed to be more stable then the nightlies.

    Keep us updated!

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  • I have been running CM10 for nearly as long as I've had the phone and I had this problem in Chicago with growing LTE coverage. I got it working when I found this solution posted here: http://www.tingusers.com/forum/archive/index.php/t-115.html

    "To get LTE and 3g working, go back to rooted stock rom and download APN Backup & Restore and Titanium Backup from Play Store. Then fellow the directions from APN Backup & Restore page. After that backup APN settings and install CM10 , use APN Backup & Restore app to restore APN settings."

    I attached the XML backup file I generated if you want to try skipping the restore to stock-based ROM.

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  • I'll give the apn restore a try next time I'm in the Chicago area. Looks promising though.

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  • OK if you have a Galaxy S3 and are using a CM10 based rom I have posted instructions and a file at the XDA devs froum at http://forum.xda-developers.com/showpost.php?p=35338440&postcount=7

    I now have 4G working on CM10! Whoo!

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  • I actually have the same problem. I am running the CM nightly on my gs3, and my wife has a galaxy nexus with stock android. She is able to connect to LTE, however I cannot. I have tried replacing  /system/etc/apns-conf.xml with both the one included in the link above, as well as a copy from her working galaxy nexus. Does anyone have a copy of this file that is currently working on a gs3 with CM10+ and Ting so that I can have something to do a comparison on?

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  • I should note that I am trying reboots between attempts, and using md5 checksums to verify that the file is exactly the same as the one downloaded. 

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  • Hey Brandon,

    I'm currently running CarbonRom (CM 10.1 based) and it's working fine, but I did run into an issue a while back where I was suddenly not getting any data, but could still connect to LTE. I did two things:

    First, I made a nandroid, reinstalled a rooted stock rom and instantly was on LTE. I did an update of PRL and any profile updates and did a dump of the current APNs on that build. I then restored to my CM nandroid (kept a nandroid of that rooted stock as well, for going back to). When I initially restored APNs in CM I didn't see any benefit... still didn't work. What I did do that worked was delete all the APNs and then do an APN restore and all was fine (I had only the 18).

    It sounds like the swap you are doing is enough to be a full wipe and full restore... I'm wondering if a) the permissions/ownership on the apns-conf.xml file are correct (root:root?) and/or if a network update you would get through touchwiz is needed. Are you running CM10 or CM10.1? (4.2.1 or 4.2.2) I feel like my issue was tied with an upgrade to 10.1, but I'm not sure. I also only use that APN Restore app... no manual copying (I'm wondering if that difference could infer a file ownership problem). You do have to convert APN Restore to a system app first (then reboot, then open), for which I use the aptly named app "/system/app mover".

    How long have you been running the phone on CM (and how out of date is the PRL/Modem)? It looks like freeza just posted (4/13) updated stock rooted Sprint TW roms on XDA.

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  • Thank you Clay! That is a lot of information and things for me to try. 

    1. I have verified that the permissions of the apns-conf.xml are the same. 

    2. I have been running CM10 since the day I got the device 3-4 months ago and thusly none of the network updates that require the touchwiz rom have been applied. 

    3. I am running CM10.1 NIGHTLY from 4/10/13, but I had the same problem with 10.0 

    4. Can you link me to that stock rooted sprint TW rom on XDA? I am having trouble finding it. 

     I am going to try the route of reverting back to the TW rom and making sure it all works, then backing up the apns using the app you suggested. I will then restore CM10.1, delete all existing APNs, and do an APN restore. If you could send me a copy of one of your working backups then I could probably actually skip reverting back to the TW rom but I absolutely have enough to try out. Thx I will post back here when I am done. 

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  • Actually I found this link: http://forum.xda-developers.com/showthread.php?t=2228368

    I think that is to the stock rooted firmware and I am going to try that, I don't have a windows machine so I guess I have to wait until tomorrow. Will update. 

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  • *solved* 

    1. I restored back to a pre-rooted factory firmware found at the link above. 

    2. I got updated apn settings by running "update pnl" and "update profile" in the settings. 

    3. I confirmed that LTE(4g) was working and was in fact kicking ass. 

    4. I backed up the apn settings using the apn backup and restore tool

    5. I then used rom manager to install cyanogenmod nightly

     

    once that was installed I restored the attached apn settings, and all was well. If you have the apn backup/restore tool working, and put this file in /storage/sdcard0/ApnBackupRestore/ then you may be able to skip all of the aforementioned work, and just restore from that.. then reboot. Thank you all!

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  • Awesome... glad that you got it to work.

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  • I have a Samsung Galaxy S3 and using the stock ROM I have good LTE connectivity in my local area. With CM10.1.2 I cannot get an LTE data connection though. I have tried using the apns-conf.xml file from the stock ROM in CM and that did not change anything. File permissions and ownerships on the file are the same in both stock and CM10.1 and both profile and PRL are up to date. Not sure what to try next.

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  • Did you use an apn recovery tool to backup and restore or just manually copy them over? I found that just copying them over didn't work and I needed to use apn backup/restore

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  • I manually copied them but I made sure I used the same ownership and permissions. I wonder if the apn backup and restore tool is modifying data from somewhere else?

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  • Yep. I did the same, and it didn't work until I used the tool. It must be doing something else somewhere. Test it out, let us know, then we can ask the developer what else it does. Be sure to reboot after changes. 

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  • OK so I made some progress. It turns out that the apns-conf.xml file is apparently supposed to be parsed on boot and turned into an SQLite database file which is what the applications actually access. For some reason this was not happening. So I went ahead and took the database files

    /data/data/com.android.providers.telephony/databases/telephony.db

    and

    /data/data/com.android.providers.telephony/databases/telephony.db-journal 

    from the stock ROM and copied them to CM10.1.2 and rebooted. That restored my 4G connectivity. All is not well though since I lost my all my text message conversations. I have those backed up and can restore them though but it would be nice to know why they went away.

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  • So MMS did not work right but I fixed that using the voice dialer trick here

    https://help.ting.com/entries/23023573--FIX-TING-MMS-CM10

     

    Everything seems to be working properly now.

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