Got a text on my cell phone: "Hi who this."

Got the text "Hi. Who is this?"  No idea who this number is.  Didn't answer it and deleted it.

Had a call from this number that lasted not even half a ring; phone had already classified it as "missed" by the time I picked up. Did not answer as I did not recognize the number. Moments later received the text "Hi. Who is this?" just as the other posters have stated.

Had a call from this number that lasted not even half a ring; phone had already classified it as "missed" by the time I picked up. Did not answer as I did not recognize the number. Moments later received the text "Hi. Who is this?" just as the other posters have stated.