Therefore, to answer: what you've received is most likely spam.
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"Can a person get messages from one of these mobile dating things if someone doesn't sign up/or leave that particular cell number?
I had one from which transfers into a sex website (porn pics, etc.) and I never have been on one of these in my life! I am afraid my boyfriend is lying to me." My first reaction was to ask the reader for more information to clarify her situation.
This isn't meant to embarrass you, or put any sort of blame on your shoulders.