iPhone does not recognise sim after software update?

Ily

New member
I have an iPhone which is unlocked. I updated it's software today on itunes and now it wont recognise my sim. Itunes gives me an error message saying "The SIM card inserted into this iPhone does not appear to be supported." I don't want to get a new sim as I've only just got this one and it's on an 18 month contract, what can I do so that it will work?
 
Back
Top