Truphone, known more for enabling WiFi calling and SMS on Nokia handsets like the Nokia N97 than being a traditional wireless carrier, is now going to be just that. Truphone recently announced they have acquired the assets of SIM4travel, a UK-based mobile virtual network operator. SIM4travel is very similar to Pat Phelan's Roam4Free service which substantially cuts your mobile roaming rates.
Prior to this acquisition, the only thing Truphone didn't have was the ability to make calls over GSM natively. They already did SMS-a major step along the way to being a mobile phone operator-and of course they operate on mobile phones, albeit Nokia Phones ones over WiFi. It's the first carrier I am aware of that will support GSM and WiFi using SIP.
I can't wait to get my Truphone branded SIM 
{ 3 } Comments
what i would really like to see happen is for this to start an era of MVNO’s that support SIP on the network level.
it just makes sense for voice calls to be handled in the more reliable circuit switched method through the carriers network. but for a roamer it would be great to be able to forward and register DID’s and SIP services that very cleanly interface with any GSM handset.
this may not be truphones plan but hopefully will inspire someone in that direction.
SIP at the core that an end user could point at… that’d be a novel concept.
Good luck
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