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Are there 4g signal detectors?
The task is to determine whether there is a 4g signal in the place where I am and if so, is it possible to measure its strength. For example, there are wi fi detectors (wi fi 2.4 Ghz, 4g 2.6Ghz) are sold in many places and cost $ 12 tehnoobzor.com/tests-reviews/pc-accessories/9-brel... There must be 4g detectors as well.
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