Hoping someone familiar with the AT&T plans can help me. We currently have Sprint, but I'd like to switch due to poor network coverage in one particular area, which I know is better on AT&T since others with AT&T have no problem there. We have two lines, an iPhone 6 and an iPhone 6s, and use about 3GB of data per month. Couple questions: (1) Is there a way to do tethering without the unlimited plan? I'd really like the option to tether / hotspot if necessary. If you get one of the limited data plans, does unused data roll over to the next month? (2) I was planning on getting new phones in the fall. Can I bring either of our phones to use until the new phones come out? I was under the impression they used different technology, but per AT&T's online tool I can just get a new sim card. Anyone know if that's true? Thanks in advance!