I already called AT&T and they weren't much help. I'm going to try talking to someone in a store a bit later today. Anyhow, my family already has a regular Family Share Plan. Not an iPhone Family Share Plan. My primary line is just a regular line, not an iPhone. The only slot on my account I want an iPhone is as a seconday line. Here is an image I made to visualize it. Basically, I need to know if I will just end up paying the extra fees on the secondary iPhone line, not upgrade the entire account to an iPhone Family Share Plan. Please, the AT&T guy was no help. Any advice is appreciated!