Iphone services, buying an unlocked/ used version

Hi, so I already have Tmobile service. I'm looking into buying an iphone 5 and have found one that is used that I might buy. It is described as "unlocked+verizon" in the title and has this on it also: "(Tmobile, AT&T etc)".SO, if I were to buy this, what would be my next step as to getting service on it? Do I need to bring it to Tmobile and get a different SIM card? Or can I just open it up and my original SIM from my first phone will work right away? (1st phone is not a smart phone).

Also, I can't remember the process I went through when I bought my ipod (bought brand new) but I remember when turning it on, I had to register it under my name… Etc. And make an apple account. How would I go about this with a USED iphone?

Talk to me on my web www.oneunlocker.com. If you have skype i have it on my web kindly add me i will help you i have done more than 1000 at&t unlocked.

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