Odd number show up in text usage

magenta2810238

    For the past few months the following two numbers show up in my text usage sporadically on all four lines on my account.  404-455-0044 and 404-455-0048.  They always show as incoming, but none of the phones ever actually receive a text message.  There is no pattern or timing of when they show up, just a few times a month on each line, sometimes two texts in a row.  When you call the numbers they're not in service. I'm worried its' some kind of spam or virus. 

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