Nano sim card for T-mobile

I have a contact 2 years with t-mobile, and now i bought an iphone 5 so i need a nano sim card. So can I just come to their store and request them to cut the sim to nano sim or request them to change the sim to the nano sim. Is that ok? If not, where can I cut my sim?

Google nano sim template and print one out. Trace this on the sim and cut it out. Its an easy process to do yourself

Not exactly, you can get tmobile to give you a new nano sim, then transfer your phone number & contacts. The sim price is like $10, but they gave me one for free, which I assume they always do, unless your rude or something.

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