Fast internet access is not obvious in rural areas and when it is time to install we realize that houses are built with special materials. The properties of these materials affect the electromagnetic wave propagation in a different way than the houses in the cities. In this work, we perform an analysis of signal quality in 700-MHz and 900-MHz bands for 3G and 4G communication systems for adobe buildings. Three different adobe wall scenarios were analyzed: conventional adobe, adobe doped with salt and adobe doped with coal. Then two kind of measurements have been carried out, the first one a Network Vector Analyzer (VNA) and two HyperLOG antenna were used and in the second one a Samsung S8 with the software from TEMS Pocket 16.3.7.26 was used. Wave propagation and signal quality measurements made on adobe walls provide satisfactory results showing large variation in attenuation and signal quality due to the material used in adobe.