Converting Blackberry Pearl 8100 from tmo to sprint?

Sorry, no. Sprint is a CDMA carrier and your 8100 is a GSM device. GSM devices once unlocked can be used on any GSM carrier (AT&T, Rogers, ect)
 
You could always try to sell the phone if you're looking to switch. Or find someone to with the other company to trade service plans (and phones) if you're both under a contract.
 
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