Can I use an iPhone with my T-Mobile phone service?

Someone had just given me a windows phone, but I already had T-Mobile service and apparently the two aren't compatible. So I have to buy another phone. I was thinking about maybe buying an iPhone, one of the older ones, but wanted to make sure that it would work with my T-mobile.

I have an unlocked iPhone 4 from AT&T and it works fine on tmobile, just make sure that the phone is unlocked

Before use T-Mobile service, Make sure your iphone is unlocked one.
If it's locked by other than T-Mobile service, you will need to unlock it. For unlocking you can approach your service provider or else try to buy an unlocking service from any one of the online unlocking service provider like http://www.onlinegsmunlock.com/apple-iphone/rs7wp9/

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