What is the cheapest family plan i can get for the iphone 5?

>I live in san diego 92114
>at least 3 lines
>want them from at&t but I wouldn't mind hearing sprint prices.
>don't usually use phones often so bare essentials family plan for the iphone 5 would be fantastic

Any other details that would help that I haven't mentioned will be addressed upon request, that's all I could think of.

Who knows

You can get a sim card for Straight Talk wireless and get unlimited talk text and web for $45 a month. It uses AT&T and T-Mobile towers, so don't have to worry about poor service. The iPhone 5 uses a nanosim, and the smallest they sell is microsim. You can go on Amazon and get a microsim to nanosim cutter cheap. This is by far the best plan I have found for an iPhone