This problem only impacts people who have data working fine when they set the phone up as a new device, but lose data connectivity after a restore from a previous device backup.
This is caused by APN settings from a previous jailbreak and comcenter patch or other modification to APN settings which can't be removed - essentially there is a phantom APN installed with the wrong settings for your LTE data plan (but worked fine on 3G). Other symptoms of this issue include:
Before beginning - you will want to have a backup of your iPhone backup in case you make a mistake! Yes, a backup of the backup.
1) Download and install iBackupBot for Mac or Windows (free version works fine, but this app crashes LOTS on OS 10.8 - just relaunch it and keep trying)
2) Open your backup and find the entry "mobile/com.apple.managedCarrier.plist"
3) Double click on the file to edit it (you can cancel the prompt for registration)
4) There is likely a more delicate change, but I preferred to wipe this file clean and let the iPhone 5 restore the correct settings. Replace the contents of this file with the following:
5) Save your change and close the application
6) On your iPhone, go to SETTINGS --> GENERAL --> RESET --> ERASE ALL CONTENT AND SETTINGS
7) Once complete, restore your iPhone from the backup you just edited
Voila - enjoy LTE.
This is caused by APN settings from a previous jailbreak and comcenter patch or other modification to APN settings which can't be removed - essentially there is a phantom APN installed with the wrong settings for your LTE data plan (but worked fine on 3G). Other symptoms of this issue include:
- The SETUP PERSONAL HOTSPOT option missing in Settings --> General --> Cellular
- If you try to install a new APN, you're told that one already exists even though it doesn't
- Trying to access data gives you the error "Could not activate cellular data network - You are not subscribed to a cellular data service"
Before beginning - you will want to have a backup of your iPhone backup in case you make a mistake! Yes, a backup of the backup.
1) Download and install iBackupBot for Mac or Windows (free version works fine, but this app crashes LOTS on OS 10.8 - just relaunch it and keep trying)
2) Open your backup and find the entry "mobile/com.apple.managedCarrier.plist"
3) Double click on the file to edit it (you can cancel the prompt for registration)
4) There is likely a more delicate change, but I preferred to wipe this file clean and let the iPhone 5 restore the correct settings. Replace the contents of this file with the following:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array/>
</plist>
5) Save your change and close the application
6) On your iPhone, go to SETTINGS --> GENERAL --> RESET --> ERASE ALL CONTENT AND SETTINGS
7) Once complete, restore your iPhone from the backup you just edited
Voila - enjoy LTE.