t-mobile question about contract?

Livelife

New member
i have a contract with me and my mother. my contract of 2 yrs is finished but not her yet. Can i upgrade to a new phone. my phone doesnt work well anymore. is this going to affect my mother's contract later on ? after her contract is over she is thinking of canceling her phone. will i be paying more or will it be the same?
 
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