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Hello there! At last I've found some spare minutes to ask you about dual band boosters. The most interesting thing is that I have rather good cell and Internet connection at home, so have no clear reasons for getting it better. But sometimes I have a permanent missing of GSM and 3G signal. Such a situation lasts for some hours and after that completely disappears to reappear next day.
The office of the company I work for is situated in the area with a very low signal. It was almost impossible to work ‘cause every time I had to look for a place with better connection. Our boss thought that the problem was the building itself. But even outside my mobile had only 1-2 bars of signal.