Roam Mobility - International Roaming Phones and SIM Cards
See also this review:
Roam free on your cell – or at least on the cheap - The Globe and Mail
Anyone have experience with Roam?
Of particular interest to me is "Lifetime UK Number & USA Number: With Roam Mobility, you get a UK number and USA number that can be used to reach you anywhere in the world. And since they
never expire, you will never to need to send new contact information to friends, family and co-workers each time you travel."
They charge CA$50 for a SIM that includes CA$10 airtime. Airtime charges look reasonable, at least in comparison to Mobal and United Mobile.