Can I just change to an iPhone?

Currently using a Sony M2. If I buy an iPhone (a friend is selling his iPhone 5) would my micro sim be compatible? The phone is unlocked.
My current contract has a year to run.

Is your friends phone unlocked? If not, your sim won't work. If his phone is unlocked, then call your carrier and be sure its compatiable with them and ask about the sim.

I don't see why not

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