Why can't iqoo use a small tail?

The reason why iqoo can't use a small tail is to protect privacy and safety. In order to ensure the security and privacy of user information, mobile phone manufacturers prohibit the use of small tail function in mobile phone systems. IQOO mobile phone may also disable the small tail function for this reason, but iQOO mobile phone users can manually add personal signatures in communication tools such as SMS or WeChat to achieve the purpose of adding personalized content in communication.