Can you use a Sprint IPhone6 on Tmobile?

I'm currently with Sprint I have two IPhone 6s and a IPad mini. I will be going to Tmobile within the next week. Can a Sprint IPhone 6 be used on Tmobile?

No, T-Mobile uses SIM card and Sprint uses a different system

Of course, you can use the Sprint iPhone on T-Mobile if you can get the phone unlocked. Sprint iPhone 6 are both CDMA and GSM capable so you can use it on T-Mobile which is GSM, just have to unlock it. If you need help with getting the phone factory unlocked, mail me for more info.

I was wondering if I can use my T-mobile iPhone 6s, I'm planning on switching to sprint. Will my phone work on the sprint network.