First, if you can not access the Internet, please try to shut down and restart; Please check whether the flow capping threshold of this month has been reached. Mobile Settings Mobile data options APN and name is set to 3gnet. If you still can not access the Internet, it is recommended that you can use the following ways to troubleshoot:[1] Confirm whether there is a network, it is recommended that you can use it in a place with strong signal;[2] Check whether the account still has phone charges, if the balance is insufficient, you need to recharge before use;[3] Confirm whether the phone parameters have been set;[4] Check whether the USIM card is properly inserted. If it is inserted but still cannot be used, it is recommended that you go to the business hall to check whether the USIM card is faulty, or change the card for test;[5] Check whether there is a problem with the mobile phone, it is recommended that you can change the test;[6] In case of traffic capping, it will also lead to no Internet access;[7] The service is suspended if the number is not registered in real name and the registration is not completed within the time limit;[8] Please try to shut down and restart to search the network.3, if not the above situation, the details suggest that you can contact the home Unicom manual customer service consultation, the actual situation is subject to local policies.Second, if you can not use 4G, you can try to shut down and restart, if it still cannot be used normally, you can check the phone Settings - mobile network - mobile data options - voice and data to see whether the default is 3G, if so, you can re-select 4G, because the specific path of each phone is different, the specific method of using your phone shall prevail; Check whether the traffic rate limit or traffic upper limit has been reached. If you are still unable to use 4G, it is not ruled out that the conditions of use are not met. At present, the use of Unicom 4G network needs to meet the following conditions:1) Mobile terminals support Unicom 4G network2) The current location is covered by Unicom's 4G network3) Use Unicom USIM card4) The phone has 4G Internet access function (you can send SMS \"KT4G\" to 10010 to apply for the service, the service will take effect immediately)If the above conditions are not available, you can contact the home manual customer service to consult whether the base station in the location is faulty and handle according to the guidelines.
12 promax mobile phone WIFI and 4g are not used may be a serious internal violation or network module failure damage, to ask professional Apple after-sales personnel to repair or test the replacement of the motherboard before normal operation