I'm going abroad and I want to use my iPhone but I don't know whether I can?

Will my iPhone work when I'm abroad or do I need to unlock it? (My O2 sim says that I will be able to use the sim in abroad but will my iPhone?

It will work abroad. The bill when you get back will be huge. Avoid using it more than the ABSOLUTE minimum.

DO NOT USE THE INTERNET. 1Mb can cost £4. 1Mb is less than one picture!1

If your iphone is factory unlocked to all carrier you can use any sim anywhere but if its carrier lock you can't use abroad.Enter your iphone imei at iphoneimei.info and check if its sim status is 'unlocked'.

Hi it will work with an O2 Uk SIM card. If you plug in another card (even though it could be O2 from a different country) it won't work. In order to put into your phone a SIM card from a different network you would have to unlock your iPhone first. By default all O2 UK iPhones are locked, so if you have not unlocked it yet ask your carrier to do that or order one of the third-party services which might be cheaper and faster.