I'm currently having an issue with my phone: after rebooting, the Mobile Data stays disabled forever (the shortcut icon is greyed out in the Settings interface, and it stays that way forever). The only way to connect to a mobile data network is to go through a factory reset.
Is there a way to work around that ? Why would "Mobile Data" remain disabled ? What can I try to enable it again without the factory reset ?
This sounds like a network issue - with my network, the mobile data settings came through automatically. Did you get any text alert from your network when you first inserted the sim card ? You could try reinserting the sim card and if that doesn't work try contacting your network regarding the issue.
I have this issue every so often. I found enabling flight mode, waiting 10 - 20 seconds, then disable. Seems to clear issue for me, failing that reboot.