43
If you need some help, call us on 0800 218 2182* or go to bt.com/producthelp
GAP compliant handsets to 
your BT3880 base to extend 
your phone system without 
needing to install telephone 
extension sockets for each 
new phone.
If a handset becomes  
un-registered it will need 
to be registered to the base 
again.
If registration isn’t successful 
in case the base registration 
period ran out of time.
handsets registered to the 
base, the registration will fail. 
You must de-register another 
handset before you can 
register the new one.
Registering another  
make of handset to your 
BT3880 base
If you want to register another 
make of handset (i.e. not a 
BT3880 handset) to your 
BT3880 base you will need 
to follow the Registration 
instructions that came with 
continue with the base part of 
the registration procedure.
Please note that registering 
other types of handset 
will only provide limited 
compatibility i.e. you may only 
be able to make and receive 
calls on the additional handset.
If you’ve bought a BT3880 multiple 
pack, any additional handsets come 
pre-registered to the base. However, 
if you purchase an additional 
handset separately, you must 
register it to your BT3880 base 
before it can be used. 
Register an additional handset
1. Press and hold the 
 button  
on the back of the base for 5 
seconds. The base is entered into 
registration mode. You will hear a 
2. Press 
, scroll   to 
REGISTRATION and press 
.
3. Enter the 4 digit PIN and press 
.  
The default system PIN is 0000.
4. Once registration is successful the 
handset will show HANDSET X (with 
X being the next assigned handset 
number). 
De-register a handset
1. Press 
, scroll   to BS SETTINGS 
and press 
.
2. Press 
 until DELETE HS is 
displayed and press 
.
3. Enter 4 digit system PIN and 
press 
.
Using additional handsets