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Absolutely not. Why would they spend a significant amount of time and effort engineering a special mode which is far more complicated, less secure, and will rarely be used?

And how is it even supposed to work? How are you going to handle billing? Does a cell phone tower even know the phone number of the connected devices? What's going to happen when the recipient disconnects mid-SMS? What happens when the same number is in use by multiple SIM cards?

No, that’s not a thing.

This is interesting. Can you explain? What leads you to believe that? Do you have any references, or is this your area of expertise?

Cell networks are not my area of expertise, but cybersecurity is, so I am genuinely interested to learn more.

I work directly with telcos. All text messages, calls, etc go through telco systems that are in data centers far from the towers. There is no benefit for one cell phone being geographically close to another to send spam messages.

Why?