Sprint and T-mobile are different types of phones. T-Mobile is GSM and Sprint is CDMA. A T- Mobile phone will not work on Sprint and vice versa.
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I agree, sounds like you need to clear davlik cache. I had the same problem reference space until I read the thread about bloatware must die. Go back and read that thread and he will talk about clearing the cache.
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You don't have to check ESN on GSM phones. I only suggest that if you ever buy a phone that was used on another carrier make sure it is SIM unlocked.
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