What is the sign that an e appears at the top of the mobile phone screen?

E stands for EDGE network, which belongs to 2.75G This kind of display screen often appears on the iPhone.

EDGE network is the transition technology from GSM to 3G. EDGE network mainly adopts a new modulation method in GSM system, that is, the most advanced multi-slot operation and 8PSK modulation technology. Because 8PSK can expand the signal space of GMSK modulation technology used in existing GSM networks from 2 to 8, each symbol contains four times as much information as the original.

Extended data:

EDGE mainly affects the transceiver base station (BTS) in the wireless access part of the network, the base station controller (BSC) in GSM and the base station (BS) in TDMA, but it has no adverse effect on the applications and interfaces based on circuit-switched and packet-switched access.

From a technical point of view, EDGE provides a new wireless modulation method, which provides three times the air transmission rate of ordinary GSM. On the other hand, EDGE inherits the GSM standard, and the carrier frequency can be dynamically switched between GSM and EDGE based on the time slot (based on the type of mobile phone), supporting the traditional GSM mobile phone, thus protecting the investment of the existing network. Edge network can be flexibly and gradually expanded, which provides favorable support for operators to maximize value.

What do "G, E, T, H" on the phone screen stand for?

Baidu encyclopedia-edge network