Annoyed by neighbour or friend's Mobile Phone GSM Jammer/Blocker, which makes you can not use any mobile phone call in or call out, or bad phone conversation, or snaillike downloading speed?
Try below solutions, you could then fight the mobile phone jammer (anti jammer) and kick them away.

Install a mobile phone repeater(booster)
A mobile phone repeater is desinged to enhance mobile phone communication qualities. It could reboardcast the signals in elsewhere to difined areas.
The mobile phone has different kinds, sorts by frequencies, GSM, CDMA, DCS and PCS.
A normal mobile phone repeater could makes you get enough signal within 5 meters radius if there is a jammer working around you.
You may click this link to see more information about the mobile phone repeater(booster)
www.ChinaRepeater.com