Okay so my phone is having hardware issues and i can't even use it for daily use,and i was wondering if i can use my sister old phone by taking out my sisters old phone sim card and putting my sim card in it.
As long as both phones are Verizon phones, and the SIM cards are the same size, yes, it should be just as simple as putting your SIM card in to activate the phone on your line. You may want to factory reset her phone so her info is gone before you put it on your account. The you can log in to your google account to get your own aps and contacts to the phone.