Below is the listing of what abbreviations shown on smartphones mean:
G is a shrunk form of term GPRS, which is the most slowest and most oldest technology used by the phones. Due to slow speed, the GPRS connection is virtually enough for example for sending messages to Whatsapp messages.
E is the abbreviation for EDGE, which is a slightly faster version of the GPRS connection. However, the speed difference between these two is quite small – even EDGE is not enough for whatsapp’s heavier applications.
The 3G connection is already much faster than the previous one: the speed of the connection is usually enough to browse web pages and listen to music over the Internet. However, smooth video playback on the internet requires a fast connection so that 3G connectivity may not be enough for a very unobtrusive viewing experience.
H is the abbreviation for HSDPA, which is a faster version of the 3G connection. However, the difference in speed with traditional 3G connectivity is still quite small and the use of the connection, especially in heavier video playback, may require patience.
H + is still an accelerated version of the HSDPA connection, abbreviated as HSDPA +. H + usually begins to run at a speed already enough to rotate the heaviest video over the internet, as long as the network used by the phone is not in the area, for example, as a slowdown due to a large number of users.
4G / LTE
An acronym for Long Term Evolution, LTE is a 4G wireless communications standard. It’s designed to provide up to 10x the speeds of 3G networks for mobile devices such as smartphones, tablets, netbooks, notebooks and wireless hotspots. 4G technologies are designed to provide IP-based voice, data and multimedia streaming at speeds of at least 100 Mbit per second and up to as fast as 1 GBit per second.
4G + / LTE +
Newer devices nowadays are also able to utilize a faster version of 4G, usually found in abbreviations 4G + or LTE +. This network allows theoretically triple speeds compared to the standard 4G / LTE connection, but on the other hand, the difference in normal telephone usage remains quite small, while the traditional 4G is for the majority of users at a sufficient speed.
5G is the term used to describe the next-generation of mobile networks beyond the 4G LTE mobile networks of today. It is assumed that 5G networks will not become commercially available until the 2020 timeframe.