Just finished installing and ready to start testing GMS 2.0. I have set
up a couple of users, and now wish to send one of them an SMS message
with the client download link.

I am asked to enter the phone number of the phone in question, in
"international format."

Here in the USA, I dial a phone number by dialing:

1 222 333 4444.
The phone number does not include a 1. With or without that first "1",
I get a "phone number is invalid.:

Further, I have never sent an SMS message from a computer to a phone
number. I have always sent it to an EMAIL ADDRESS. With verizon, for
instance, it would be:

Try that, same answer, invalid phone number. A regular email to that
that address does indeed work.

What's up with that?