Can i use an iphone sim in a sony xperia u?

I've currently got an iphone 3gs, and i'm due an upgrade on o2 but none of the tarriffs suit me, so i was going to just buy the handset for £100 and put in my iphone simplicity 15 month sim with 300 minutes, unlimited texts and 500mb of data with unlimited Wi-Fi as i only pay £15.60 as i did a sim only deal, i've been due an upgrade since February 2012? I just want to know if i can use my sim card and my tarriff as it is now in a sony xperia u? I need to no before tomorrow! Any experts out there?

Yes it'll work fine. They both use the same type of sim card.

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