You can Unlock HTC EVO 4G from Sprint network lock.Then use with other CDMA network.Sprint is CDMA network,you can unlock it and use with only CDMA network.T-Mobile is GSM network you cannot use it with unlocked CDMA HTC PHONE.Visit the site Superunlockcodes.com
get unlock code at low cost and unlock HTC EVO 4G phone. http://www.superunlockcodes.com/htc-evo-4g/rs12wp9/