I have been a T-Mobile customer for almost 2 decades, I have had my current Galaxy S10 for nearly a year, but in the past few months I get complaints from from my friends who use Verizon that they cannot text me, no matter what they do. They can call me, but neither SMS or MMS texts go through.
Other times I'm getting multiple copies of the same text from them over and over again. Sometimes it's 10 copies within the span of a few seconds Other times I'll get it repeated minutes apart but for like up to an hour or two.
Since it is happening with multiple Verizon users, I'm guessing that it is some sort of breakdown in the gateway between T-Mobile and Verizon. I can call and text them fine.
Getting kind of frustrated with it because it's not just personal calls, but work related stuff and calls related to running my volunteer fire department, of which I am an assistant chief. I am on the T-Mobile first responder magenta plan if that might be a contributing factor.
My phone has all of the latest system updates from T-Mobile. Rebooting my phone has not fixed it. It's been going on, intermittently, since late April 2020.