What should I do if my mobile phone keeps receiving sales calls and spam messages?

Many people are often depressed. Although I didn't disclose my mobile phone information, there were still many harassing calls and sales calls. In fact, everyone doesn't know that although we didn't disclose our mobile phone information, there are many apps on our mobile phones, which will easily reveal some of our mobile phone information and privacy. So how can we prevent our information from leaking? First, we can download some secure encryption software. Second, there are many encrypted mobile phones on the market at present. Personally, I think Kuanmi mobile phone has done a good job in preventing privacy leakage, because I am also using it.