I don’t know that a mobile phone jammer can block incoming phone calls

Let me solve the problem for you. Just like any other kind of radio frequency band, incoming calls can be easily blocked. They are signals and have wireless characteristics from the world of electronic gadgets. Therefore, to block these signals, you need to use electronic equipment from the opposite industry. And this industry is the signal cell phone jammer industry. To block a call, you need to know the frequency that the call is using. Once you have this information, all you have to do is get a cell phone jammer to prevent you from using and using the frequency you need.