Pda Universal
Mobile Phones by Paul Polkinghorne
A mobile phone allows calls into the public switched telephone system over a radio link. Early cell phones were usually bulky and permanently installed in vehicles, they provided limited service because only a few frequencies were available for a geographic area. Modern cellular cell phones or hand phones make use of the cellular network concept, where frequencies are used repeatedly within a city area, allowing many more users to share access to the radio bandwidth. A mobile phone allows calls to be placed over a wide geographic area, generally the user is a subscriber to the phone service and does not own the base station. By contrast, a cordless telephone is used only within the range of a single, private base station.
A cell phone can make and receive telephone calls to and from the public telephone network which includes other mobiles and fixed line phones across the world. It does this by connecting to a cellular network provided by a mobile network operator. In addition to telephony, modern mobile phones also support a wide variety of other services such as text messaging, MMS, email, Internet access, short range wireless communications (infrared, Bluetooth), business applications, gaming and photography. Mobile phones that offer these more general computing capabilities are referred to as smartphones.
The first commercially automated cellular network (1G) was launched in Japan by NTT in 1979, initially in the metropolitan area of Tokyo. Within five years, the NTT network had been expanded to cover the whole population of Japan and became the first nationwide 1G network. In 1981, this was followed by the simultaneous launch of the Nordic Mobile Telephone (NMT) system in Denmark, Finland, Norway and Sweden. NMT was the first cell phone network featuring international roaming. The first 1G network launched in the USA was Chicago based Ameritech in 1983 using the Motorola DynaTAC mobile phone. Several countries then followed in the 1980s including the UK, Mexico and Canada. The first modern network technology on digital 2G cellular technology was launched by Radiolinja in 1991 in Finland on the GSM standard, which also marked the introduction of competition in mobile telecoms when Radiolinja challenged incumbent Telecom Finland who ran a 1G NMT network.
Low end mobile phones are often referred to as feature phones, and offer basic telephony, as well as functions such as playing music and taking photos, and sometimes simple applications based on generic managed platforms such as Java ME or BREW. Handsets with more advanced computing ability through the use of native software applications became known as smartphones. The first smartphone was the Nokia 9000 Communicator in 1996 which added PDA functionality to the basic cell phone at the time. As miniaturization and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the smartphone has evolved, and what was a high end smartphone five years ago, is a standard phone today.
Other features that may be found on mobile phones include GPS navigation, music (MP3) and video (MP4) playback, RDS radio receiver, alarms, memo recording, personal digital assistant functions, ability to watch streaming video, video download, video calling, built in cameras and camcorders with autofocus and flash, ringtones, games, PTT, memory card reader (SD), USB (2.0), dual line support, infrared, Bluetooth (2.0) and WiFi connectivity, instant messaging, Internet email and browsing and serving as a wireless modem. Nokia and the University of Cambridge demonstrated a bendable cell phone called the Morph. Some phones can make mobile payments via direct mobile billing schemes or through contact less payments if the phone and point of sale support Near Field Communication (NFC). Some of the largest mobile phone manufacturers and network providers along with many retail merchants support, or plan to support, contact less payments through NFC equipped mobile phones.
Gsm Cell phones require a small microchip called a Subscriber Identity Module or SIM Card, to function. The SIM card is approximately the size of a small postage stamp and is usually placed underneath the battery in the rear of the unit. The SIM securely stores the service-subscriber key (IMSI) used to identify a subscriber on mobile telephony devices. The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another cell phone or broadband telephony device. A SIM card contains its unique serial number, internationally unique number of the mobile user (IMSI), security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to and two passwords.
About the Author
Brandsdragon Consumer Electronics is one of the worlds leading new electronic gadgets suppliers. We supply cool electronic gadgets to thousands of satisfied customers worldwide.
Universal Car Windshield Swivel Mount Dock for PDA Cell Phones/GPS/PMP/MP4
|
|
Australian City Streets: On PDA v. 1 … |
|
|
Tenergy Centura AAA Low Self-Discharge (LSD) NiMH Rechargeable Batteries, 1 Card 4xAAA $6.95 Features and Benefits * combines all the features of the alkaline battery (Ready to Use) with the benefits of rechargeable battery |
|
|
Tenergy Centura AA Low Self-Discharge (LSD) NiMH Rechargeable Batteries, 1 Card 4xAA $1.95 Features and Benefits * High quality AA Size 2000mAh rechargeable Nickel Metal Hydride (Ni-MH) battery, top of line. |
|
|
Duracell myGrid $121.41 With Duracell myGrid you can charge up to 4 devices at one time. Just place your myGrid enabled devices anywhere on myGrid’s surface and they start charging – It’s Charging Made Simple…. |
|
|
ET PDA Personal Digital Assistant E.T THE EXTRA-TERRESTRAIL PDA PERSONAL DIGITAL ASSISTANT STORE YOUR : *SECRET PASSWORDS SPECIAL FEATURES: 2K MEMORY |
|
|
Barcelona Small PDA/ RIM Blackberry Curve 9300/ Curve 9330 size Universal Horizontal Cell Phone Case / Pouch / Holster with Belt Loop & Belt Clip [2 PACK] $12.99 Includes 2 Barcelona pouches! This Barcelona brand universal Small PDA, RIM Blackberry Curve 9300 & Curve 9330 size Horizontal Cell Phone Pouch has a soft inside with a 1.5″ belt loop & belt clip, so they won’t fall off of your belt! This Small PDA size Horizontal Cell Phone Pouch will fit Smart Phones & PDAs up to 4.6″ high X 2.50″ wide x 0.55″ thick. Can be used with clip only (you don’t have t… |
|
|
Belkin F8U1400 Gladiator Hard Case for PDAs $19.99 Ideal for use while traveling, the Belkin F8U1400 provides your PDA with solid protection against almost any damage. When closed, the case is resistant to water, and its scratch-resistant cover keeps it looking good while it’s busy keeping your PDA in pristine condition. Size adjusts with four plastic pins, allowing the case to work with nearly any PDA. Holders for business cards and your stylus a… |
|
|
Frankenstein Costume Universal Studios Hollywood Movie Costumes $52.52 … |
|
|
WiFi Link Pen Drive USB Key For SONY PlayStation PS3 / PSP & Nintendo DS / Wii & PC $21.00 WiFi Wireless USB Adapter that works w/ PSP, PS3, NDSL, & Wii . No cables is needed, it’s wireless! This device is even able to connect Laptops & PDA’s! One card does it all… *Note internet connection & wireless router is required!!!… |
|
|
Belkin F8V366 Mobile Cassette Adapter for MP3/CD/MD $19.95 The Mobile Cassette Adapter from Belkin easily connects your portable MP3, CD, cassette player, PC, or laptop to your car stereo, through your car’s in-dash cassette player. It provides an easy way to transfer quality sound from any portable audio equipment to your car stereo while on the road, on the beach, camping, or anywhere you would use a portable tape player. Designed for outstanding audio … |
