second, accidentally set it to flight mode, and if necessary, you can turn on the control center, turn on the airplane mode first, then turn off the airplane mode, so that the mobile phone can search for the mobile network signal again.
Third, the mobile phone is slow, so you need to restart the device:
Fourth, your phone card is loose, so you need to try plugging and unplugging the mobile phone card again ...
Fifth, if it doesn't work, it may be a software problem. It is recommended to refresh the machine. It is recommended to download the firmware from the synchronization assistant on the pc side. There is a detailed tutorial on refreshing the machine.
Sixth, if the above problems are not solved, it will need to be repaired by someone at the maintenance point. It is estimated that it is a hardware problem.
Other reasons for the poor xr signal of Apple are as follows:
1. Apple no longer cooperates with Qualcomm, and Apple gave up its cooperation with Qualcomm, thinking that the charging standard in Qualcomm is not high. Negotiations between the two sides broke down and they no longer cooperated. Apple's signal is weakened due to the lack of baseband provided by Qualcomm.
2. The mobile phone case made of metal affects the signal. The metal mobile phone case looks more textured, so most people will choose the metal mobile phone case, but the metal material can weaken the signal and cut off the flow.
3. Non-mobile users, among the three major operators, the quality of mobile communication is generally good. Some users use Unicom or telecommunications, and the signal is limited in the region, and the signal is weakened by fewer base stations.
it can be solved by restoring the network settings as follows:
1. open the settings app on the mobile phone desktop,
2. select the general option in the settings,
3. select the restore option in the general settings,
4. after entering the restore, select the restore network settings,
5. enter the mobile phone password, and the system restarts and restores the mobile phone.