How does BBK k202 send group messages?

Hehe ... My mobile phone is K202. It's easy to send short messages in groups ... After entering the information, press the option key at the top left (only one message is sent in the middle), and then press the option key to select the SIM card you use (card 1 or card 2), and the following will appear: send, save, send, send in groups (both send in groups and send in groups), and you have selected send in groups.