This has been happening for years. I don’t know why and how it is possible. There are some company where I can’t receive notification, automatic, or verification text from. For example, I am trying to sign up to Zelle. Their system told me they are sending me a text with confirmation #, but my phone never receive the text. I had the same issue with ATT, Golden One bank and many other companies.
This doesn’t happen to all companies. Some works just fine. What is going one? How do I solve this issue? I have unlimited call, text, and data. My current device is an IPhone 8, but when I have the issue with my old HTC device as well.