I'm on Verizon OK, from what I can tell, there is no additional charge for me to use this. Does anyone know otherwise? I'm on the share everything plan, so I assume I'm fine so long as I don't go over our shared allowance, and we have tons of data leftover each month. *please tell me if anyone knows differently. So I'm assuming when I turn it on, that then my phone becomes a wifi router, yes? So I could presumably use it with an ipod touch or an ipad wifi, right? I'm confused about the allowed users and how I give permission, since I have not turned this on yet. Can someone tell me how this all works, from start to finish. Thanks!!