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I really hope T-Mobile offers a nano sim card... I don't want to hack one to work if I don't have to.
 
That sounds like a pain.
So not only you have to cut around the sim but you have to shave the sim's thickness to make it thinner?
Im positive Tmobile will make sure they have plenty of new nanosims to accomodate all their customers that will buy or upgrade to the unlocked new iphone.

Use some fine sandpaper
 
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