Can no longer receive messagaes from iPhone 6

[AC Question]

I used to get texts from my son. When he sends a group message with my number in the group, I am not getting the messages.

 

[itguyjax8430]

I used to get texts from my son. When he sends a group message with my number in the group, I am not getting the messages.

What kind of phone do you have? Do you know if the group message he sends is being turned in to a MMS?