Can you unlock a Sprint phone to work for T-Mobile ?

No, T-Mobile uses a GSM network while Sprint uses CDMA you could use the T-Mobile phone on At&t however but not on Verizon/Sprint.
Verizon/Sprint can be used interchangeably and T-Mobile and At&t can as well.
Verizon/Sprint wont change with any phone on T-Mobile or At&t or vice versa.

Hi visit Onlinegsmunlock.com to unlock your Blackberry 8530 mobile from Sprint network .Here they ask you the IMEI number of your mobile .Then at last they deliver you code to unlock your mobile.

Is it possible if I can use a HTC 4g sprint phone with a T mobile plan?

Hello all,

I found a deal on a Galaxy S3 and went for it. Soon, very soon I found the coverage is well below par. Galaxy 3s have always been at the top of my list of favorite phones. I don't know what to do on this one. If its not compatible with another provider than I will have to but another phone. I am recovering from a full hip replacement and just got bacl to the states so I really don't have the money to spend. I do have like 3 G3s ( including the sprint G3 less than a month old, also a Motorola smart something. I would love to find another carrier that my sprint phone would work for.
Suggestions??