Sony PEG-SJ22 - Manual (Page 60)

Customizing your Sony CLIÉ™ handheld (Preferences) 60
Sony Personal Entertainment Organizer A-BGK-100-11 (1)
Adding/Changing the modem preferences
6 Enter the modem initialization command in the Init String .
By default, it is set to either AT&FX4 or ATZ . The modem
initialization command is not required to be changed unless it is
specified on the modem.
7 Tap OK .
6
Tap OK.
The configuration for the modem is changed and the Preferences screen
is displayed.