................TETRA and the GSM phone networks work in a similar way. Handsets contact each other via a network of masts. The TETRA handsets can also be used as walkie talkies. SIM cards within the handset will give you access to whichever network you are allowed to use. The UK police network is called Air Wave. I use a TETRA based system at work which will only allow access to the company network. I keep the handset switched off unless I have to use it. The problem is the frequencies used which are said to match those of the human brain. Some people living near police TETRA and indeed mobile phone masts claim to be affected by the signals................This site contains much useful information............
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