What happens if when you get the "number disconnected message" if you wait a little longer before hanging up? Some times for others, the call still goes through. It's not the way things should work, but it may be a temporary work around?
Can you call your cell phone number(s) from your Ooma phone number?
If you can't call your cell phone number(s) from your Ooma phone number, besides doing what Murphy suggested, try making some calls to your cell phone(s). Then go to you My Ooma Call Logs at https://my.ooma.com/call_logs
, and cut and paste the numbers that wouldn't go through, to include phone number(s) Date and time etc., in an E-mail to Ooma Customer Support, and explaining what is happening.
Note: Ooma like very recent phone number information.
Phone: 1-888-711-OOMA (6662)
Monday-Friday 7am-7pm PST
Saturday-Sunday 8am-5pm PST