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2. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA.

3. iPhone 7 - Wikipedia

   en.wikipedia.org/wiki/IPhone_7

   The iPhone 7 and iPhone 7 Plus [a] are smartphones that were designed, developed, and marketed by Apple Inc. They are the tenth generation of the iPhone.They were announced on September 7, 2016, at the Bill Graham Civic Auditorium in San Francisco by Apple CEO Tim Cook, and were released on September 16, 2016, succeeding the iPhone 6, iPhone 6 Plus, iPhone 6S and iPhone 6S Plus as the flagship ...

4. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices such as mobile phones and tablets. GSM is also a trade mark owned by the GSM Association. [2]

5. GSM frequency bands - Wikipedia

   en.wikipedia.org/wiki/GSM_frequency_bands

   In North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Canada, GSM-1900 is the primary band used in urban areas with 850 as a backup, and GSM-850 being the primary rural band. In the United States, regulatory requirements determine which area can use which band. The term Cellular is sometimes used to ...

6. List of iPhone models - Wikipedia

   en.wikipedia.org/wiki/List_of_iPhone_models

   For iPod Touch models, see iPod Touch § Models. Left image: The backs of an iPhone 6, an iPhone 7, an iPhone 8, and an iPhone SE (3rd generation). Right image: The backs of an iPhone 15 Pro, iPhone 15 Pro Max, iPhone 15 Plus, and iPhone 15. The iPhone, developed by Apple Inc., is a line of smartphones that combine a mobile phone, digital ...

7. LTE (telecommunication) - Wikipedia

   en.wikipedia.org/wiki/LTE_(telecommunication)

   LTE stands for Long-Term Evolution [7] and is a registered trademark owned by ETSI (European Telecommunications Standards Institute) for the wireless data communications technology and a development of the GSM/UMTS standards. However, other nations and companies do play an active role in the LTE project.