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Starting with their appearance these devices went through different changes in their performance or look. iPhone 3G for example, the second generation of iPhone released on market on 11 July 2008, has A-GPS location and 3G cellular network capabilities. In addition to the new technology (based on its GPS incorporated in iPhone) this device appears as a blue dot that is pulsating continuously on a Google map in a blue dot shape. Its shape, color ( for example the second generation of iPhones can we seen in a black or white aluminum combined with plastic – cover), LCD display, GSM signal, volume controls, silence switch, SIM card slots, headphone jack and the wake/sleep buttons, 2MP camera ( however it doesn’t have a flash or focus options; the optical zoom and video recording option is also missing), its long lasting battery (can last till 300 hours with the iPhone put in standby time) are just some of the reasons why you should buy this gorgeous, trendy and so useful in a lot of domain devices.
Does Apple iPhone work with any carrier? What do you think? Let’s talk a little about the GSM signal. GSM meaning Global System for Mobile communications is an international standard in Europe and a lot of other countries. The common point of these countries is GSM, the single cellular service that’s available. In mobile telecommunications GSM represents a digital system that uses TDMA. TDMA is a 30 kHz wide narrow band (channels) that splits time wise in three time slots. GSM operates in the 900 MHz or 1800 MHz band ad provides the following features: data networking makes phone calls more secure, call forwarding, caller ID, SMS, multi-party conferencing.
Apple specialists' wish and accomplishment was to build a device that could access thousand, hundreds of global carriers. With a CDMA it was a dead-end technology. GSM was the perfect solution. iPhones are available for activation just through Apple wireless carriers. It means that some options are not available in other countries or locations than America. The device is programmed to verify if you have an account with that carrier. If you do you’ll be able, based on some instructions that you’ll receive on your iPhone to activate your carrier. In a word iPhone was design to use a SIM card on which the subscribe data was stored. SIM cards are issued to use a carrier. By a locked phone you have to understand a phone that does recognize a SIM card that uses a specific carrier; in a word that mobile phone is “loyal” to just one carrier because of software that has downloaded on it. An unlocked cell phone uses SIM cards from any carrier.
What should I do in order to benefit of a device with multiple carriers? With the software solutions that were recently invented (iPhoneSIMfree.com) in just a few minutes you can obtain a full SIM unlock. This means that users outside US you can benefit from a lot of applications, SIM cards – various frequencies on which to talk. After unlocking your iPhone, you can activate your SIM with an iActivator or iASign. With just a few differences at your Visual Voicemail and of course YouTube – these are AT&T features you’ll have a normal iPhone.