"The company isn't commenting on plans, but it's easy to imagine a scenario similar to the 3UK/Skype arrangement. Calls made from a Truphone-equipped handset would be routed over the cellular network to the nearest Truphone hub, and then converted to VoIP connections for cheaper routing "
I don't quite understand how you get to this assumption about a so-called Truphone hub, as the SIM card is on an mvno and is roaming on a UK network, and the calls are routed via 2 other companies as well. At the moment UM's tariffs are already slightly cheaper than its reseller, so it will be interesting to see what happens
What's more, I don't understand how you expect this to help with the T-mobile dispute, as Truphone has not become a main GSM network by dint of this, and Jersey mobiles aren't in T-mobile inclusive minutes either.