I'm thinking of a pre-paid for a one way move from SF to LA and I don't have a car charger for my older Nokia phone. I do have a wall charger though. Too much to buy a new phone right now. So has anyone has any luck with pre-paid? Are they recommended. I need to make sure I have a phone during this long drive 400 miles, in case of an emergency. my current phone could run out of battery.