I have an iPhone 3GS
I currently have a contract with O2 in the UK, although its now on a month to month basis, and I have had the phone unlocked.
I am abroad for a bit, and would like to use a local service provider rather than pay for international calls.
I recently went and bought a prepaid sim card from Vodafone. I ahve inserted the new sim card, synced with itunes, but it is just saying no signal?