If you need some help, call us on 0800 145 6789* or go to bt.com/producthelp 
If you’ve bought a BT8500 multiple pack, any additional handsets come pre-
registered to the base. However, if you purchase another additional handset 
separately, you must register it to your BT8500 base before it can be used. 
You can register up to five GAP compliant handsets to your BT8500 base.
Register an additional BT8500 handset
1. Select Menu, scroll 
 to display Settings and press Select.
2.  Press 
 to highlight Registration and press Select.
3. Register is highlighted, press Select. 
4. Press and hold Find button on base is displayed.
5. Press and hold 
Find
 on the base until you hear a beep and the In use light starts 
to flash.
6. Immediately, select OK on the handset. The handset will display Registering 
handset to indicate the base is in registration mode. If you have changed the 
system PIN from 0000 you will be prompted to enter it, then select OK.
7. Once registration is successful the handset will show Handset x registered (with 
X being the assigned handset number). The handset will then synchronise data 
with any other registered handsets, e.g. contacts, speed dials, handset names 
and text messages.
  You have 2 minutes to complete the registration process. After 2 minutes the 
In use light on the base will stop flashing. If registration isn’t successful the first 
time, please try again incase the base registration period ran out of time.
Using additional handsets66