my nephew was playing with my phone(i have an LG Prime with at&t) and somehow he locked it. now it keeps asking for a PUK code. i tried entering that 00000 default code to try and reset it seemed that like it was following through and after i verified it is said "Incorrect PUK Pin" so i kept trying and now im down to 4 chances. so do i have to take in to an at&t store so they can unlock it or is there some other way i can do it?