Just a thought...
Is the sender's number stored in your phone's phonebook?
Some phones divert messages from unknown numbers to a different inbox and don't notify you. Kind of like the spam/junk filter on your email account.
I could think of a few other quirks that might be causing the problem. I'm not a professional, more an enthusiastic amateur who's had a mobile since the networks were developing in the mid-90s and a little technical knowledge was helpful to get them to do what you wanted.
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