I am in the USA with roaming turned on but no data (having burned through £100 in data as the phone wouldn't connect to the network).
I have checked for updates, restarted the phone, cleaned the sim card, tried to manually register (AT&T and Verizon are available but they stick on 'Registering on...' until I get 'Unable to register'). I am showing 4 bar signal strength but 'Not registered on network'. Please help! I am spending a fortune and have no telephone access.