If this is a website that is calling you, then obviously you can get
the info (if in a Java servlet through HttpServletRequest's
getRemoteAddr and if in a GWT RPC call through the same mechanism
available in the LocalThread (I forget the exact name) of the remote
method itself). This is very easy.
I live in Canada. I have a Toronto cell phone number (with SMS). I
have tried to verify my Google App Engine account several times, and
it fails with User Name or Phone Number error. It gives me no details.
No place to ask for help. I followed all the instructions. And now it
says I've tried too m
