My iphone 5 mobile data is also down. settings> general > mobile data > has even lost the option to maually add the apn settings. All's i have is on/off toggles for mobile data, enable 3g, data roaming.
try these setting as they work on my iphone 5 and reboot your phone
ios6) Settings > General > Mobile data > mobile data network Under APN put: APN: giffgaff.com Username: giffgaff Password: password (this is the word "password") leave visual voicemail empty (gg don't do it) under MMS put: APN: giffgaff.com Username: giffgaff Password: password (this is the word "password") MMSC: http://mmsc-ac.mms.o2.co.uk:10021/mmsc MMS Proxy: 188.8.131.52:8080 Max MSG size:307200 Settings > General > Network/Mobile Data > Enable 3G <ON> Settings > General > Network/Mobile Data > Cellular Data <ON> Settings > Messages> MMS Messaging <ON> You may also need to reboot your phone to implement these settings.
my problem is that i dont have to option anymore to add my own settings as the mobile data network is not on my iphone 5. it was the other week though. as i put them in manually after updating to ios 6.1