Tell us about yourself!
Anyway. Thanks for the tutorial. Maybe Your phone uses the sim card as a antenna somehow..? No idea.
I don't really get how it works. Tried it on 3 different phones and 1 old phone, nothing has changed. Sim cards don't have any antennas in them. Your phone does. And there is a real way to boost Your signal by plugging a extra antenna to that little coax like antenna port on the back of Your phone.