Why are there mobile phones that can take pictures but no cameras that can make calls?

The technical core requirements of a mobile phone are not high. If it can send text messages and make calls, it has achieved all the functions of the mobile phone. No matter how you improve these two aspects, it will only increase the number of users who can make calls and send and receive text messages. experience, and there will be no difference between professional and entry-level phones like a camera (have you ever heard of the terms professional phone calls and entry-level phone calls), so more development can add other functions such as photography and games. Advanced cameras enhance the value of professional use, and more room for development can be devoted to photography. Finally, professional technical functions are of course difficult to be compatible with other professional functions, so mobile phones can take pictures, but cameras cannot make calls. Similarly, if the specialization is done just to improve the call quality (this quality can refer to the characteristics of clear calls, stable signals, etc.), then it may be a military-grade communication tool, and this is beyond the scope of our definition of mobile phones. Of course, it cannot be denied. In the future, there may be some technical means to establish a connection between the two.