Who called from 4844402736

I received a text message from this number. It said, "Heyaaa Troy". That was it. Second message I received like this in two weeks, each from separate numbers but the exact same message. I replied back to the first one, but nothing more from that number.

Got a text "Heyy ;)" nothing more.  Since I don't know anyone from that area code I did a search and found you guys.  I won't respond though.

I am getting a text message from this person, they will not identify themselves.  Asked me to add them to Yahoo Messenger.  This is the text I received:
"Hi!!"
I replied with "Who is this"
Response:  "a.dd me on y.a.h.0.0.msngr .. ID is bellaflirt7
Again I replied with "Who is this"
Response:  sorry I have no battery life :(
I responded that I would not add them unless they identified themselves and I was going to block their number.  No response back at this time.

This text started at 5:47pm and I did not respond until 8:41pm and last response was at 8:46pm

I got same message but from 323 645 5398

I recieved a text today 1/7/2013 :
text said : Hi ;)
I replied: Who is this?
Text said ;)a.dd me on y! IM...id is marlenegurlie
Number was : 484-440-2736