Buying an iPhone for Tmobile?

I want an iPhone, and I know Tmobile now carries them, but it is so much cheaper to buy them online. So I was wondering if it possible for me to buy an iPhone, that has been used by any previous carrier, and simply use my Tmobile sim card and have it just work like that. I don't want to have to jail break my iPhone. Or should I simply just buy one from the store?

If you buy an iPhone from a different carrier you would have to have it unlocked before using a tmobile SIM card. My suggestion is either buy an already unlocked iPhone or just from the company.

If you buy one, it has to be a GSM model (which means no Verizon or Sprint phones). The AT&T version will work if it's unlocked and you will get 4G service in many cities (but not everywhere). You will need to check with T-Mobile to ask if you can bring an AT&T iPhone where you live.

Frankly, it's not that much cheaper. Anything really cheap is going to be old or possibly defective in some way. T-Mobile will sell you one for $100 and about $20 per month for 24 months with a no-contract plan. This is a new iPhone 5. Check their website.

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