Iphone on T-Mobile or Metro Pcs?

I have metro pcs right now and was just wondering, If somebody gave me their iphone, could i bring it to tmobile and have them use my same number that i had at Metro?

Of course you can. Or you could just put the sim in the iphone and stay with Metro pcs. But if you wanna change to t mobile, they'll easily give you a sim with the same number you had.

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