People across the US - on all mobile networks - received strange and out-of-context messages with many of them originally sent on February 14, and some going back two years.
One Reddit user - who also collated other reports of the occurrence - wrote: "Early this morning my sister and I received text messages that we had sent each other on February 14, 2019.
"It turns out other people are reporting similar events this morning."
It's said the glitch was caused by a maintenance update for the platforms used by a number of US carriers.
Sprint said in a statement: "[This] caused some customers to have older text messages resent to their devices.
"The issue was resolved not long after it occurred. We apologize for any confusion this may have caused."
Meanwhile, third-party vendor Syniverse later took responsibility for the glitch which saw more than 168,000 previously undelivered messages get sent during internal maintenance.
The company's chief marketing and product officer William Hurley said: "While the issue has been resolved, we are in the process of reviewing our internal procedures to ensure this does not happen again."