[quote=briansd1][quote=CDMA ENG] Why not just have them buy a 30 day SIM card? And must global firms have some kind of roaming deal with AT&T. Its part of their open world alliance thing…
Most of these devices allow you to Ad Hoc a Wifi network but I think they will only accomadate 4 or 5 simuteanous connections. Meaning you will need more than one. With two device you should be ok if the devices can monitor the other channel and makes sure it wont interfer with the other devices operating frequency.