I have heard rumors of this idea working with att: switch phone to a non smart phone, call in and switch it to your main device and add data for $10 a month. Once new phone arrives put sim in new phone and you are good to go. I haven't tried it and I doubt I would but I have seen many people talk about doing it.

As far as overseas, them guys have their $hit together when it comes to wireless. It is a shame they can't standardize it a little more here. It is about like the metric system, it is so easy but yet we have never made the switch.