The reason why mobile phones cannot access QQ may be: 1. QQ version is not applicable. 2. The phone hung up. The signal is not good for the time being. 4. Set the connection mode, select GPRS or JAVA to confirm whether the network is connected normally, then click Settings → Advanced Options → Clear IE cache in the mobile phone network, and then restart the mobile phone. If it still doesn't work out. I think the easiest way is to go to the nearest mobile phone store, find a mobile phone repairman, and ask him to make a QQ version suitable for your mobile phone directly according to your mobile phone, adjust the settings of your mobile phone, and you can use it directly. If there is anything else you don't understand, just ask together. Of course, it may cost some money, but it's much simpler. I encountered a lot of troubles and anxiety in the process of using mobile QQ. I made a lot of calls to China Mobile and Tencent's customer service, but they didn't help much. Later, I gradually figured it out, and now I can use it normally. So in my experience, I still spend some money to save my mind, and I have taken many detours and been in a hurry. I hope I can help you.