How do you register a second phone to the bt studio 1000 phone

1. Check the manual of your new handset on how to set it to registration mode.

Then on your BT Studio Base

2. Press and hold the base (page) button for at least 10 seconds until you hear the validation tone. then release. That's it.

for this model, you can only use up to 2 handsets.

hope it helps.