Okay, finally think I have done a reset as all the data appears gone, i.e. log in info for messenger etc.
Same situation with phone. I have taken some photo's which i can send if helpful. Basically they show O2, Orange, T-mobile and Vodaphone at some point or another but all fail after a few seconds. It is not the same providers that come up each time, different combinations and I havent had more than three at once time. I took 20 to 30 pics over a 10 minute period where scanning brought different results each time but no network would lock on. I swapped a Vodaphone sim for the two O2 ones I have but no joy. Really have tried all I can think of. If anyone has any ideas please help. Thanks Sean