Foreign netizens have found that IOS 14 contains a new design of field test mode, which allows users to see all kinds of information more intuitively. The IOS field test mode adds a new home section, which allows you to view LTE cell service information, as well as modules with LTE, UMTS and GSM functions.
compared with IOS 13 field test mode, the function of IOS 14 field test mode is not changed much, but the interface is redesigned. Field test mode allows iPhone users to access detailed operator network connection information, which is specially designed for engineers or operators, and is generally not used by ordinary users.
open the phone app, input * 3001 ාාාාාාාාාාාාාා), and then press the dial key to enter the field test mode. Here is the IOS 13 field test mode.