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It may even improve the signal of the iPhone 4 at the same timeJust make a little aluminum foil hat for your phone and it should be fine
If you didn't know, even if the phone is "turned off" and the battery is still in it, it still sends a little signal all the time. The only sure method to avoid tracking is to take the battery out of the cell phone.This is one reason that I always turn my cell phone off when I leave home, because all (recently built) cell phones has GPS tracking devices built in. Only when I need it, I turn it on.
"An RFID tag was scanned at a distance of 69 feet, and that was back in 2005, the possible reading distance now is probably much greater than that."RFID tags are also only good out to about 2 feet. Useless for tracking purposes.
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