Hey guys. I just launched a company, Zengo Wireless (zengowireless.com), that sells affordable quad band GSM phones and United Mobile SIM cards. Part of my website is designed for people to submit tips so that they can make calls for even cheaper while they're abroad. I've been reading this forum for a while (but just joined) and people seem to have success with using callback companies like callbackworld to make even cheaper calls with a SIM card like UM. Would anyone have any tip about that they'd be willing to share with similarly minded US based international travelers? If you want to see where the tip would go, it would be in the Zengo Passport section. (zengowireless.com/passport)
Also, for those US members, my company provides fast shipping, if you need UM SIM cards sooner than you would otherwise receive them.
Khalisha
