I tried this, and I could only make it work when the phone was without a case. When I touched the metal directly I could make the signal go from 5 bars to 2 ba

I tried this, and I could only make it work when the phone was without a case. When I touched the metal directly I could make the signal go from 5 bars to 2 bars. With the case on I could not make it change at all. EDIT: this was holding it with my left hand, I did not try it right handed.