At&t prepaid service has been off for couple months. For $26 i can turn it on. Havent needed to. Recently popped the sim into an old phone. No service. Ive been jacking around in hidden service menu. I put the phone down and the battery died. I plugged it up and turned it on. Now the service is on. Data and all. Running fast at that. Still have a balance to pay and everything. I looked at the network settings under mobile networks. Its says network preferred setting is 20. Can anyone explain this to me please?