To calculate your 2-D position (latitude and longitude) and track movement, a GPS receiver must be locked on to the signal of at least 3 satellites. With 4 or more satellites in view, the receiver can determine your 3-D position (latitude, longitude and altitude). Generally, a GPS receiver will track 8 or more satellites, but that depends on the time of day and where you are on the earth. Some devices can do all of that from your wrist.
The first smartphone was developed by IBM and BellSouth, which came out to the public in 1993. Althought basic compared to todayâs standards âSimonâ had a touch screen that was capable of accessing email and sending faxes. Smartphones are major extensions on normal cellphones.
Apple Phones. Apple's first smartphone was the ROKR E1, released on September 7, 2005. However, the ROKR was an Apple and Motorola collaboration and Apple was not happy with Motorola's contributions. Within a year, Apple discontinued support for the ROKR. On January 9, 2007, Steve Jobs announced the new iPhone at the Macworld convention.