If U want to Set 'unreachable'
or 'out coverage area' in your
airtel
First Keep More Than 1rupee in
Your Mobile
then goto diverting option.
Then go2 Setting
Then select cal divert option
then activate other number
then type that column
Remove ur last number and
put it.
Eg > your number is
9895******
And divert box
enter this
9895******
Remove last number of ur
mobile number.
It is very useful.
The other way is:
Just remove ur mobile's
battery without switching off
mobile,atleast 30 minutes
caller will here unreachable
sound.