Hi i just got an iphone from ebay. and the screen of the iphone was broken. i couldn't use it because of the screen wasn't working so i changed the screen and everything works fine exept that wifi is low and some times it disappir now i have another iphone and the wifi works fine so i know its not me router. so my quastion since the guy that had this phone unlocked it and install alot of stuff to it could that couse it to have a low wifi or is it me when i changed the screen (now i know its not me but whatever)
i wonder if i restore the iphone to its original state would that help.

please help and yeah the iphone is 4 gb 1.1.2 FW MFW 04.02.13

thanks