Our T-Mobile contract is up in a few weeks, so I've been reading articles/reviews/posts, calling carriers and generally making myself crazy. We've been with T-Mobile forever but its time to cut that cord. Their coverage in our area is lame at best, and not getting any better with age. Part of the problem is that we live on an island (yes, island) right in between San Francisco and Oakland, so we don't rank very high on the coverage meter - although Verizon and ATT seem to get the job done best (according to people Ive talked to around town, at our jobs, etc). Weve been using very nice Android phones, but will switch to the iPhone 5S when its released. We dont use much data as we use wifi connections a lot and dont really download very much. My wife does travel to Vietnam, and needs a phone that will accept and work with a local sim card when shes there. Im also a teacher, so I qualify for discounts with Verizon and ATT. I guess Im just seeking a little feedback on what Ive been able to decipher so far - please feel free to correct me or suggest whatever. A shared data pan seems like the best option if data usage is on the small side. Both ATT and Verizon tell me their iPhone 5 will work in Vietnam with just a simple sim swap. Im leaning towards ATT over Verizon mostly because speed and coverage seems better in our particular area (coverage is a priority at this point, not price, although well subsidize the iPhones). Is there a good technical article or website that explains the differences between the technology ATT and Verizon use for their cellular signals? (Im not an upgrade every year kind of person, but I want to know about future expandability and compatibility for each carriers technology.) I have an iTunes library with about 3 GB of music, so I believe a 16GB phone would suffice? (Again, Im not really a power user - just a school teacher with an eye for quality, over quantity.) Thanks.