O2 iPhone Sim card question

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Joined
6 Feb 2003
Posts
1,105
Location
London
So im on a 3g simplicity tariff with o2 atm, what I would like to know is if I buy the iphone on pay & go, can I only use the sim that it comes with or can I use my previous sim card in it and access the full functionality of the phone? I know O2 like to lock you in pretty hard with this phone..
 
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