Why do mobile manufacturers mostly use Qualcomm's CPU?

This is because Qualcomm has the most patents in the field of mobile communication. Its technology and patents in the field of mobile communication almost monopolize the whole field of mobile communication. Whether it's making a mobile phone or building a base station, it's hard for you to bypass Qualcomm's patent.

In a mobile phone processor, there are both application processor AP and baseband processor BP. In terms of baseband modem, Qualcomm is also the leader, covering all wireless communication protocols of 2G, 3G and 4G. Apart from Qualcomm, only Marville can barely compare with it. Qualcomm's mobile phone processor includes not only ARM core, but also wireless modules such as cellular communication baseband, WiFi, Bluetooth and NFC-so many wireless modules are integrated into one processor that few companies can do.