This is the song Irreplaceable by beyonce on I-Phone Apps

My current phone is breaking apart so I am buying a new used phone. Verizon will transfer my new number and current service to the new used phone, but what kind online drugs of information do they need? I assume that whoever sells me the phone (off of craigslist or ebay most likely) will also need to give me the serial number of that phone. What other information about the phone do I need to make sure the seller has?

I want to buy a phone from walmart, order prescription drugs without a prescription but i dont know how you connect it to your cell phone plan. I dont want to get it if it is going to be a pain in the butt to get it connected. My cell phone plan is verizon. Please help me!