That varies by carrier to carrier.
T-Mobile never charges for Verichat if you are on the Unlimited plan.
It doesn't use minutes or SMS. It uses data, and your T-Mobile plan is unlimited with no caps.
The newest versions of Verichat uses less bandwidth. The next version will use even less bandwidth, since it's going to go all over a single socket and the keepalive code only needs to operate on one socket.
By the time the single-socket version is released, it should be safe to even run under Rogers with its 25-megabyte cap on its so-called "Unlimited" plan.
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