hey i have this same problem with this number.. i think it is cause nimbuzz. i download it and then after that this number is calling me sometimes even at night, it make me angry cause one day it woke me up at 4 am..

hey it's again me. i tried to fing out who is this and i know the answer now. the people who has nimbuzz on te phone, have to type their phone number to get "buzz". if this number +31313131 is calling, that means somebody send to u "buzz" to open nimbuzz when  u're offline. i will be happy if i helped someone with that problem :)

best regards mallow22022

FAJNA FUNKCJA W NIMBUZZIE , MOZNA WYWOLAC KOGOS DO ROZMOWYD3T9

it's a call from a "NIMBUZZ" when some one make the call for the ebuddy from the nim they call you from that no. so don't worry it's nothing

I was also confused. but later i realised dat it was that nasty nimbuzz