I don't know if this works. There is no other way to find out than by looking at the stripes on your phone. My bar went up by one even after moving the antenna, but I didn't see a performance gain in anything (calling, texting, surfing, hotspot). This may or may not work. Webboost should give us the ability to determine this, in addition to having the consumer pay $500+ for a placebo effect.
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