Which mobile phones have the function of sending short messages in groups?

Nowadays, most mobile phones have the function of mass sending, that is, mobile phones that can't be sent in groups before, as long as you install new software, but the charge for telecommunications is not based on how many times you send it, but on how many people you send it, which is not appropriate. If you really need this kind of business, you'd better send it to mobile phone users by computer. The fee is fixed.