Can I use my Sprint iPhone 4s on T-Mobile?

My contract with Sprint already expired. What I want to know if there's a way to use my iPhone with T-Mobile. Now I already understand that they use different technology, but my Sprint phone has a SIM card slot in it with a Sprint SIM inside. So if I unlock it could I put a T-Mobile SIM in it and use it with their service?

People like you are the ones that always aggravated me at when I worked for sprint. Partly because questions like this are annoying as hell and partly because of your obvious lack of common sense. Right after the call. Lol It says sprint if its a sprint compatible device. It says t mobile if its a t mobile compatible device. Why do you think they make phones with different carrier names? No, it doesn't work. That's like asking if McDonalds would be able to sell you taco bell.

Hi Sprint phones are not compatible with AT&T or T-Mobile. I would recommend selling it on Ebay and buying a T-Mobile or unlocked GSM phone.
You can then get an unlimited plan starting at $39/month with Solavei and save a lot of money each month!

http://www.iPhoneFactoryUnlockUSA.com

100% free unlocks for all iphones all carriers and for all iphones. (Sprint, Verizon, At&t, T-Mobile)

They unlocked my at&t 4s, sprint iphone 5, and my Sprint iphone 5s!

Enjoy!

@Shawn: Your intelligence surprises me as you work in a Sprint store. I can't believe they hired you because you have no idea what your saying. Every cell phone can be unlocked that has a SIM CARD slot. (iPhone 4S and later )

@yessentialoils: Please do some research, Sprint and Verizon (CDMA) can be unlocked to be used with GSM carriers. (AT&T, T-Mobile) I have had a sprint iphone 5s, and an iphone 5 sprint, and i unlocked both using the site above.