Panasonic EB-GD35 - Manual (Page 36)

Setting a Warning Level
A warning can be set as an indication that the maximum cost is
about to be reached.
1 From Idle mode press B 624 to enter the Warning at
menu
2 Press B to edit the value
3 Enter a value (in units) at which you want the warning to sound
and press B
Call Meter
This feature is SIM dependent. The function of the Call Meter is to
displaythe accumulative call charges and units used.
1 To reset the call meter, press B when Reset is displayed in
the main option area
2 Enter your PIN2 or lock code to continue
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Call Information