So, I have Verizon on my LTE iPad. For me, this was a no brainer since they had better LTE coverage/speeds here in San Francisco, and if I was out of an LTE area I could pop my AT&T SIM into it and it would still work if I really wanted. However, for the iPhone 5, I'm a bit torn. I use simultaneous calling and data *all the time*. Verizon has better coverage, so for dropped calls I'm in favor of switching at this point based on how awesome the LTE has been on my iPad. And yet, I'm just not sure. I don't really use my LTE iPad outside of San Francisco all that often, but I do use my phone a lot. And if I'm outside of LTE range, I won't have calling and data simultaneously nor will I have the faster data speeds of AT&T's HSPA+ network. What is worth it? The pricing is about the same, but Verizon offers free tethering on their data share so I can potentially get rid of my iPad's data plan afterward.