I somehow managed to run over my Galaxy S5 phone this weekend, and even though it was in a lifeproof case, it was completely destroyed. I have the Edge plan, with two lines. The balance remaining on the phone is about $350. My question is, what is the cheapest way to go about replacing this phone? I am allowed to upgrade once I pay the $350 to pay the phone off. I can get a used Galaxy S5 from a 3rd party for $250, which I'd rather do. Can I just purchase the phone from a 3rd party and have them activate the device and keep paying my monthly fee? I don't want to screw up my plan either, since there is some kind of discount for having Edge. I don't need my bill going up too. Any help would be greatly appreciated!!!