Issue: "iPhone 4 consistently drops call when we are touching the lower left corner of the device."
How to fix it?
A. Permanent Fix:
B. Temporary Fix (Fix it yourself):


How to fix it?
A. Permanent Fix:
- Conductive anodizing on WiFi antenna => Nonconductive anodizing.
- Conductive anodizing on UMTS antenna => Either conductive or nonconductive anodizing.
B. Temporary Fix (Fix it yourself):
- Bumper
- Case
- Non-conductive Tape