What is iPhone 4S  iPhone 4S is a touchscreen-based smartphone
developed by Apple Inc. It is the fifth generation of the
iPhone, succeeding the iPhone 4, and was announced on October 4,
2011. It became available for pre-order on October 7, 2011 in
seven initial countries (United States, Canada, Australia,
United Kingdom, France, Germany and Japan) with the first
delivery date set for October 14, 2011, and available on that
same day for direct in-store sales in those countries. It was
released in 22 more countries, including Ireland, Mexico, and
Singapore, on October 28.  The phone retains the exterior design
of its predecessor, but hosts improved hardware specifications
and software updates. It added a voice recognition system known
as Siri from which the "4S" designator came, and a cloud storage
service named iCloud. Some of the device's functions may be
voice-controlled through Siri. The phone is available for 100
cell service carriers in 70 countries, including eight carriers
in the United States.For US cu