i just recently purchased the otterbox case for the 8350i. ever since i put it on people have been telling me that they can here themselves echo when they call me and that they can barely here me. i know it s the case because it doesnt echo when the case is off. after reading this forum i looked inside my case and i also have a raised 2 and a square grid on the inside but havent noticed any damage to the phone yet. also would filing down these moldings inside the case void any type of warrenty that the case may have?