Unable to text someone but can call them


This is not specific to Samsung Galaxy S9+ but I don't know where to start.  A few days ago I lost the ability to text someone.  We can call each other.  I can get his texts but when I reply, he never gets my messages.  We've both been through our phone settings.  We're not blocked as far as we can tell.

He's about to get a new phone with Verizon (was AT&T).  Maybe this problem will go away.  But if the problem is with my Galaxy S9+ then it could still happen.

Yes I have texted other people and I can send and receive as expected.

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