Maman joon i am testing my new fon tell me if u got my mssge
from a 310 phone number, Tuesday, August 31, 1:17 PM EST

Considering the number of misspellings in this text, I guess it's most likely that 310 is trying to say "Mama and Joon." But what I prefer to believe is that 310 is French, and he calls his mother maman. Is that so much to hope for?