i need help resetting my t-mobile phone without actually being in the phone..? help?!?

i found a gravity smart phone (tmobile) and i dont know the password or the google account so i cant actually use the phone.. and i really would love to use it! .. is there anyway or any buttons i can click so i can reset the whole phone? Please Helpp!! .. when i turn the phone on it it has 9 circles where you drag around to make a picture, and i tried everythingg ! how do i reset it so i can use the phone?
 
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