Why did the mobile phone network suddenly become 2G?

1. If the phone is in arrears, it will automatically become 2G or 3G, and you can't access the Internet.

2, traffic security settings, there will be a traffic management in the application settings, set the current month's traffic package, as long as it reaches the warning line, it will automatically cut off the traffic, and will turn 4G into 2G.

3. Local 4g network signal problem: Due to poor local 4g network signal, the coverage is not comprehensive. Causing the cell phone signal to become a 2g network.

2G is called the second generation technology, with digital voice transmission technology as the core. In addition to the call function, some systems have also introduced the short message function, which also supports data transmission and fax, but because of its slow speed, it is only suitable for small-capacity e-mail, software and other information.

3G(3rd-Generation) refers to the cellular mobile communication technology supporting high-speed data transmission, which is the third generation mobile communication technology. Its rate is generally above several hundred kbps, which can transmit voice and data information at the same time. At present, there are three 3G standards: CDMA2000, WCDMA and TD-SCDMA, and CDMA technology is the mainstream in the industry.