I only have another set of small sizes. Can you send him a message?

Group trumpet can send and receive short messages, provided that you are all in a group and you have a trumpet in this group.

If your mobile phone can't send text messages through trumpet, you need to see if you are in the group. If not, there is no way.

If you can't send it in the group, you should check whether there is a signal, the setting of the SMS center and so on.

If you send the message normally and don't receive it, the other party may have set it for you.

Since we are all in the same group, don't limit yourself to sending and receiving short messages. You can go to him directly or indirectly.