When conferencing another number after connecting to the second party:
A seven-digit dialing pattern is not supported.
Do not prefix the dialed number with a '9' as is currently required with a traditional PBX (Private Branch Exchange) system. If a '9' is accidentally added, the call fails and the caller receives an error recording.
Wi-Fi Calls always originate in the U.S., even when a customer is outside of the U.S.
Calls to U.S. numbers aren't billed (except for 411 or other premium calls).
Calls to international numbers are billed according to your international long distance plan.