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You can try to build your own special mechanism to boost the cellular signal at home. To do this you will need: a piece of iron wire (35-40 cm), 2 connector blocks, small bolt and nut, 10 m of coaxial cable, a piece of a water pipe and a plastic container.
We live in the mountains in Andalucía, Spain without any cellphone coverage at all, either in the house or on the terrace. It was really impossible to contact with someone by phone and all that complicated our life a lot.