How many people can the same text message be sent to a day? I can only send a group message to four people, and then this message can't be sent to anyone. . . . . .

Hello, there is no limit to the number of times the same message can be sent. In general, only a few mobile phones will set a contact person who sends the most messages at a time, but they can continue to send them.

In this case, it should be a mobile phone, not a sim card. I suggest you try another mobile phone.

Hope to adopt, thank you.