https://arstechnica.com/information-technology/2019/11/why-168149-valentines-day-text-messages-arrived-in-november/

Did you get a Valentine's Day text message on November 7? If so, you can blame a company called Syniverse, which provides text-messaging services to major mobile carriers.

Syniverse helps deliver text messages via its intercarrier messaging service and boasts that it is "Connected to more than 300 operators" and processes 600 billion messages per month.