I saw the Xcelis post on Leonardo's site and opted to not blog it because I thought there was something fishy about the service. God bless Aswath, one of the smarter dudes out there when it comes to VoIP.
What he's basically saying is that calls from Xcellis won't be passed over the USA's largest mobile carrier's network on the inbound. That makes me remember the line from the original "Ghostbusters" movie with Tom Hanks. "Who ya gonna call."
Thus my new nickname for Aswath--Ghostbuster !