Help CenterIf you are switching from HTC to Mango Voice, we currently do not recommend forwarding calls from HTC to Mango Voice during the number porting process. Mango Voice's system allows simultaneous inbound calls, but HTC's system only seems to allow one active call at a time. This means that while forwarding from HTC; if your office is on an inbound call and another comes in, the second (and any subsequent calls) will receive a busy tone.
Once your numbers have ported, your Mango Voice phones will ring for inbound calls.