Let me talk about several reasons why different mobile phone headphones are incompatible.

Found some oil. When buying multiple mobile phones, sometimes the headphones of each mobile phone are not compatible. For example, the iPhone cannot control the Nokia lumia 920. Now let me also talk about the incompatibility of headphones. Generally speaking, there are some details. There are two earphone standards in the world, OMTP and CTIA. The four-wire arrangement of OMTP standard is left/right/microphone/neutral line, and CTIA is left/right/neutral line/microphone. The difference between the two is that the zero line and the microphone connection in the last two paragraphs are misplaced, and the others are no different. Chinese mainland uses OMTP standard, while most foreign countries, such as the United States, Japan and Hongkong, use CTIA standard. That is to say, your headphones are not compatible, generally speaking, because there is a problem in the matching between parallel mobile phones and licensed headphones, or it is not simply a problem of brand incompatibility, because the licensed headphones of domestic iphone also use OMTP standard, right?