I put a new o2 sim card into my wildfire early on today and now i can Type anything like when i do a text message or put something into the internet address bar.

What could be the problem?

I have turned phone off and on a few times but still having the same problem.

Is it worth doing a phone reset?

Ive just put my Old Orange sim card in and it was ok so why should it be to do with the o2 sim card?