If you don't have a headset, you'll need to use the text chat feature.
How To Quickly TEXT CHAT IN GAME in COD MODERN WARFARE 3 (Control Tutorial)
COD Modern Warfare 3 on consoles allows you to communicate with other players at any time using voice chat with a headset. While that is nice, what if you don't have one? It's time to text chat!
Text chat is available on PS5 and Xbox consoles, although it's a bit more difficult to open and use than on PC. It's nice to have the option available though.
In this guide, we'll tell you how to open and use the text chat interface on the PS5 and Xbox versions of Modern Warfare 3.