Why can't Huawei mobile phones send text messages in groups?

The SMS channel is blocked. According to Huawei's official mobile phone information, due to traffic jam in sms channel, it is impossible to send short messages in groups. Huawei is the world's leading provider of ICT (information and communication) infrastructure and intelligent terminals. It is committed to bringing the digital world to everyone, every family and every organization, and building an intelligent world with the Internet of Everything.