An easy way to get the data and facetime to work is hook up to wifi on the iphone.
Go to [Only registered and activated users can see links. ] which will allow you to get full 3G and Facetime it will install that for alot of devices.
As far as MMS:
You have to be jailbroken and I saw rich had instructions on how to add Teatherme to it thats the best way.
Another easy way for devices not on IOs 5 you can put a different sim card in change the settings for MMS in
Settings>General>Cellular Data Network and alter the MMS settings Most of the time it works..
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