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Implementation in practice of modern life technical appliances shows that the life of people in such a space is unbearable because of a great number of devices, several networks and connections. Bad cellular connection, frequent disconnects and the voice in the cell phone 'out of the coverage', low battery in your iphone – are trustful friends of modern iphone users.
I’m very satisfied with AT4000W! It was unbearable when I couldn’t use my mobile phone. That horrible signal drove me up the wall. I live in underground room. The mobile signal was absent because there was not enough coverage.