Swapping phones

jarr

I've currently got a Samsung S2. Worst phone I've ever bought and android is rubbish. My contract is up December 2013. If I sold it and bought an iPhone 4S could I use the sim card and get the same allowances or is the sim locked to the Samsung phone?

grumbler

A sim can be locked to a network, not to a phone.
Unlike S2, iPhone needs a smaller micro-sim. You can just cut excessive plastic from your sim (cheap cutters are available on ebay if you want) or ask the network to send you a replacement micro-sim. Some networks will try to rob you in this case: How the hell can Orange do this?