Step one: Please confirm that the phone has not been misused, such as turning on airplane mode and turning off data traffic.
If it is confirmed that it was a misoperation, please manually turn off airplane mode and turn on data traffic. As long as there is data traffic, it's OK.
Step 2: Please confirm whether the mobile phone bill is in arrears or the mobile phone card data plan has expired.
You can log in to the official website of the telecom operator of the mobile phone SIM card to check whether your account is in arrears, or check through the telecom operator's WeChat official account. If it is in arrears, just recharge the amount greater than the arrears amount until the phone bill is in arrears. After receiving the account message, just restart the phone.
Step 3: Check whether it is the operator's network problem, such as no signal at the base station, or the operator's network upgrade or system upgrade.
The fourth step is to check and eliminate mobile phone problems.
Use mobile anti-virus software to scan your phone for viruses. Or the mobile data of those programs checked in the background is turned off or the traffic exceeds the traffic value set by the software and the software forcibly disconnects the network. If there are no problems mentioned above, it is recommended to go to the after-sales service to conduct a comprehensive test on the mobile phone hardware to see if it is a hardware failure.
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