email of text from myself???

I received two emails this evening from (mycellnumber)@mms.att.net. Each contained a text titled "text_0.txt"

When I opened the texts, they were gibberish. One said "h yo", the other "flysbo". Looking at the time stamps, I wasn't even using my phone when these were received. What really has me perplexed is that they came from MY phone number.

Is this anything to fret over (virus?) or just a fluke?

Tia