Looking to add a line possibly to my account for my Dad. He's been on Alltel for years, and the coverage is garbage around my area. I pay about $112 a month. Would it be just an extra $30 a month? Plus, would he get to choose a new phone? I'm on an iPhone 5, white, 16gb now. Thought about getting his new phone and giving him mine. I don't care about the 5s, but do actually like the new 5c models. Isn't it suppose to replace the 5? I just need more GB's really. Any info would help. Thanks!