I've recently bought a second-hand iPhone 4S. It was on Vodafone contract and today a lady in the Vodafone shop put a pay as you go sim in the phone. As soon as the sim went in I had no service an as the lock button is broken on my phone I can turn it off with assistive touch but there is no where for getting it back on (as far as I know) so I can't turn it off to Reset it.
My question is why do I have no service?
What do I need to do and
For 10 points whether I should take the sim out and put it back in again?
Every bit of help appreciated