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2. Comparison of mobile phone standards - Wikipedia

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

   GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM . Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.

3. Access Point Name - Wikipedia

   en.wikipedia.org/wiki/Access_Point_Name

   Access Point Name. An Access Point Name ( APN) is the name of a gateway [ 1] between a mobile network ( GSM, GPRS, 3G, 4G and 5G) and another computer network, frequently the public Internet. [ 2] A mobile device making a data connection must be configured with an APN to present to the carrier. The carrier will then examine this identifier to ...

4. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   The iPhone 4 is a smartphone that was designed, developed, and marketed by Apple Inc. It is the fourth generation of the iPhone lineup, succeeding the iPhone 3GS and preceding the iPhone 4s. Following a number of notable leaks, the iPhone 4 was first unveiled on June 7, 2010, at Apple's Worldwide Developers Conference in San Francisco, [ 7] and ...

5. 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.

6. Voice over LTE - Wikipedia

   en.wikipedia.org/wiki/Voice_over_LTE

   Voice over Long-Term Evolution ( acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [ 1][ 2] VoLTE has up to three times more voice and data capacity than older 3G UMTS and up to six times more than 2G GSM. It uses less bandwidth because VoLTE's packet headers are ...

7. iPhone - Wikipedia

   en.wikipedia.org/wiki/IPhone

   The iPhone is a smartphone produced by Apple that uses Apple's own iOS mobile operating system. The first-generation iPhone was announced by then–Apple CEO Steve Jobs on January 9, 2007. Since then, Apple has annually released new iPhone models and iOS updates. As of November 1, 2018, more than 2.2 billion iPhones had been sold.