Inmarsat LandPhone User Manual page 23

In all these scenarios, refer to "Changing the channel number", below.
Changing the channel number
To change the currently stored channel number(s):
1. Turn on the LandPhone, and wait until Searching displays.
2. Lift the telephone handset, and key in #63*. The LCD displays
OK, to indicate that the currently stored channel numbers have
been deleted.
3. Replace the telephone handset.
4. Register with the satellite, as described in "Registering with the
network". You may need to manually enter a channel number at this
stage, if automatic registration does not occur.
5. If you did not manually enter a channel number at step 4, manually
enter the required channel number as described in "Entering the
channel number", on page 23.
24
Connecting to the network