Yep, leave the T-Mobile one alone if you haven't used it for a while. Try turning the phone off again, pop either the O2 or Vodafone one back in. Then go into 'Settings', then 'mobile network'. What does the "Active network" read at the top?
I believe you've also tried this but try scrolling down whilst in this 'mobile network' screen to "Network selection". Try selecting 'automatic', if that doesn't work try tapping on the network that the sim belongs to. Also, whilst in Network selection, do the other networks such as O2 and Vodafone have the word 'forbidden' underneath them?
11-07-2013 05:26 AM