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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.
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