Digital Cellular Wireless Technology

Explanation
The 1G system used analog radio signals. Analog signals are continuous waveforms that vary in amplitude and frequency, allowing for the transmission of voice and data. In contrast, digital signals use discrete values to represent information, which was not utilized in the 1G system.

Explanation
AMPS stands for Advanced Mobile Phone System, which was the first generation (1G) analog cellular system introduced in the United States in 1983. It was primarily used for voice communication and had limited capacity and features compared to later generations. GSM (Global System for Mobile Communications), GPRS (General Packet Radio Service), and CDMA (Code Division Multiple Access) are all examples of 2G and 3G mobile phone system standards, introduced after AMPS.

Explanation
2G systems were introduced in 1991. This was the second generation of mobile telecommunications technology, following the first generation (1G) analog systems. 2G systems brought significant advancements such as digital voice transmission, improved call quality, and the ability to send text messages. It also introduced the concept of data services, allowing users to access basic internet features like email and limited web browsing. The introduction of 2G systems marked a major milestone in the development of mobile communication technology.

Explanation
SMS, or Short Message Service, is a modern feature in today's mobile phones that was introduced within the production of the 2G system. SMS allows users to send short text messages to other mobile phones, making it one of the earliest forms of mobile communication. It became widely popular and is still widely used today as a quick and convenient way to communicate. MMS, iMessage, and BBM are all more recent features that were introduced in later generations of mobile phone systems.

Explanation
The other versions created within the second generation are 2.5 and 2.75.

Explanation
GPRS, which stands for General Packet Radio Service, was introduced during the 2.5G version of the second generation of mobile networks. This upgrade allowed for faster data transmission rates compared to the previous 2G networks. GPRS enabled the sending and receiving of data packets over the mobile network, making it possible to access the internet, send emails, and use other data services on mobile devices. This advancement laid the foundation for further improvements in mobile data connectivity.

Explanation
Video Calls and Conferencing were not services used within 2G. 2G, or second-generation cellular technology, primarily focused on voice calls and basic text messaging. Video calls and conferencing became more prevalent with the introduction of 3G and subsequent generations of cellular technology.

Explanation
In some countries, the delay in implementing 3G technology can be attributed to higher licensing fees. These fees may have posed a financial burden for telecommunication companies, making it difficult for them to invest in the necessary infrastructure and equipment required for 3G networks. As a result, the rollout of 3G services may have been postponed until the licensing fees became more manageable or until alternative funding options were available.

Explanation
There are two possible systems that can support 4G.

Explanation
4G technology is an advanced wireless network technology that offers better coverage compared to its predecessor, 3G. It provides a wider network coverage area, allowing users to access high-speed internet and make calls in areas where 3G coverage may be limited or unavailable. With 4G, users can experience faster data speeds and more reliable connectivity, making it an improvement in terms of network coverage.