I definitely understand how you feel! I'm totally lost without my phone. We can definitely activate an old phone for you to use as long as the phone is a VZW device. You can also activate it online http://vz.to/1zaF0Vx. Please keep in mind that you will not be able to activate a prepaid VZW phone on your post paid account unless that device has been on a prepaid account for at least 6 months.
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Make sure that VZW is well aware that you're not activating a second line...you're just swapping phones for the time being. I'd hate to see you have to fight a mess with them over a phone swap that was viewed as a second line activation.