I used Roam1 Mobile SIM card for my trip to US (USA Standard 30 with BB). The only good thing that they did was delivering the SIM on time and I think that was where it just ended! Call quality throughout the trip was unsatisfactory! Most of the time the sim showed no network! I kept restarting my phone to make it work but of no use! We have complaint to their customer service a million times but have not got any respite from them. Very dissapointed