Message said add them to my y-messgr "faitflirt9". They had my first name. I don't get this at all. How did they get my name and mobile number

Yep got a text from 971 239 1763 and they had my first name. Something fishy here, dont know them or that number

heyaaa robin
a.d me on y!...id is ariannawoman73
sry i have no reception :(

got a text from this number with heyy  (____) and then ask for me to add them to y! messenger..gracechick4 and then it said oh no I have no battery life :(