I use OneSimCard for travel when my primary phone can't be used. Using VOIP costs less than making calls on the wireless carrier. The only thing I don't like about this app is it will only ring on vibrate.
Teka Tamerat Etc
Lousy documentstion and instructions. Customer support is lesa than helpful, giving instructions instead of links to the appropriate menú on the diré. Still cannot make any calla on this APP. Customer support sounds like they are blaming me instead of helping me.
It's a rip off sand it is NOT cheap! The one card sim does not work well in Asia! And there are so much restrictions on their data plan on different countries that you might as well buy a local sim card instead. They'll find every opportunity to charge you for every charges in the fine print. You should definitely find another service provider!
Receiving call is expensive to the calling to simcard. The voip use WiFi if you have WiFi available you are better go Skype or Obi.
Good quality Goid quality and low price abroad. No value in domestic