Phone Number Extension 091
or
Phone Number Shorthand 091

091 by itself is ambiguous. ICUC thinks you might have entered an undefined shorthand telephone number abbreviation or a telephone number extension without a preceding telephone number. To make use of telephone number shorthand abbreviations you must first perform a login from this device. After login, depending upon how you have set up your account, here are some valid ways to use three .ac digits:

091.ac Ex: Access web site of recent telephone number who's last three digits are 091
or
a.091.ac Ex: Get definition of and information about area code 091
or
c.091.ac Ex: Calendar for last used telephone number ending in three digits 091
or
e.091.ac Ex: Email last used telephone number ending in three digits 091
or
i.091.ac Ex: Instant Message last used telephone number ending in three digits 091
or
s.091.ac Ex: Get status of last used telephone number ending in three digits 091
or
w.091.ac Ex: Access web site of recent telephone number who's last three digits 091
or
x.091.ac Ex: Access web site of recent telephone extension who's last three digits are 091
or
800.555.1212.091.ac Ex: Access web site of telephone number 800.555.1212 extension 091

more information on telephone number shortcuts, extensions and status codes...