I purchased an Ooma telco with one handset in April. I waiting until the number was ported in October, and then purchased three more handsets. I registed the other thee. One of them becaume unregistered, so I tried to re-register it. I didn't work as there were already four registered. I had to reset the telco device to factory defaults and re-register all four handsets. It isn't easy or fast. Now a week has passed, and a different handset has become un-registered. I tried to register it and got the same message that no more could be registered. Is there a way to do this without resetting to factory defaults and re-registering all four handsents every week?
*#*#191
dialed from a phone connected to the Phone port of the Telo will unregister all of your handsets.
They will all go to auto registration mode.
You can then register them one at a time.