When the mobile phone receives a strange message, open the above URL and automatically download An Dongdong. I think it must be a malicious plug-in or something. How to delete it?

This should be service information, wasting our traffic, very hateful! In the past, many deduction traps were caused by this kind of information. I suggest you turn off the "service information" item in the SMS setting function, and you won't receive such information in the future. The location of each mobile phone model is different. If it really doesn't work, you can take it to any communication service hall at 100 and ask their staff to help you set it up. Free, dear ~ ~