For one JUMP really wouldn't do anything for you with a phone that is paid off 100% anyway (other than of course insure it which was included with JUMP 1 &2) because all JUMP did was pay off the remainder of your existing EIP so that you could then sign up for a new one. Example, I had a Galaxy S7 Edge and just JUMP'd to the GS8 when it launched. I still owed $460 dollars on the GS7e and even though used/trade was only worth a couple of hundred and some change the JUMP covered the difference to complete the EIP. JUMP 2 was a little different in that you had to pay off 50% before you could JUMP where as with JUMP 1 like I have I could JUMP whenever (up to 2 in a rolling 12 months) so again for example I used to JUMP every 6 months or so which meant that I had only paid 25% of the EIP. Essentially JUMP is like "gap insurance". Now even with JUMP if your credit required a deposit, that didn't change with JUMP so even if you had JUMP, had the previous EIP paid off whatever your deposit your credit dictated was the deposit you had to pay even with JUMP. You also have to pay the sales tax with each JUMP.