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Android Central Question I just bought a sprint s10 on ebay - will I be able to use it on tmobile?
Since the T-Mobile purchase of Sprint was completed, all Sprint phones are able to access all T-Mobile bands.
So theoretically the Sprint phone should work fine on T-Mobile whether or not it has been SIM unlocked.
If you are already subscribed to T-Mobile, I'd call the T-Mobile customer service and work with them on getting the phone provisioned correctly.
If you are not a current T-Mobile subscriber, I would vist a T-Mobile store with your phone, and talk to a T-Mobile Rep about getting your Sprint S10 on a new T-Mobile account.