Phone Number Extension 1871
or
Phone Number Shorthand 1871

1871 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, here are some valid ways to use four .ac digits:

1871.ac Ex: Access web site of recent telephone number who's last four digits are 1871
or
c.1871.ac Ex: Calendar for last used telephone number ending in four digits 1871
or
e.1871.ac Ex: Email last used telephone number ending in four digits 1871
or
i.1871.ac Ex: Instant Message last used telephone number ending in four digits 1871
or
s.1871.ac Ex: Get status of last used telephone number ending in four digits 1871
or
800.555.1212.1871.ac Ex: Access web site of telephone number 800.555.1212 extension 1871

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