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It is definitely possible to cut the microSIM to nanoSIM. I changed from iPhone 4s to iPhone 5s with no problems. That's the instruction I used (in German):


Resetting your iPhone will not impact the contract (data plan) you have with a carrier. You will loose all data stored on the phone itself though, so make sure you have a backup (or, if you store your data in the cloud, the login/password data for all your online accounts).

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