I think the reason its only "compatible" with certain providers is because some only offer call forwarding of all calls, and not call forward no answer transfer - which is whats really needed for this.
I was able to sign up with a Telus account in Canada by claiming that I am a Verizon customer - and I received the confirmation text message with no problem.
Telus does not offer call forward no answer transfer though, so its pretty much useless - plus, I'd be paying long distance to forward my calls to the US.
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