How to connect an iphone 4s to any company?

My brother's friend is sellin an iPhone 4s in good condition but she says you can connect wit any company. So if I was to buy it how could I connect it to tmobile? And by the way how much should I pay for it bein an iPhone 4s? Serious answers please.

If you buy it you could call the company and they will explain the prices and things like that

There's a way to connect it to t-mobile. Check out the "bring your own device" page on their website. You can also call them and someone will assist you in getting your phone linked to tmobile.

It is unlocked so you simply buy a sim card from tmobile and get it activated. There won't be an extra cost.

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