How to Boost Galaxy S7 Cellular & Wifi Reception?

Although our Apple and Kindle devices work all over our home and elsewhere without problems, our Galaxy S7's reception is iffy.

We live in a brick house with numerous large windows, which makes indoor cellular service difficult. However, although we have decent wifi, the Galaxy S7 shows extreme fluctuations when we use our wifi booster app, and we can't access Drippler on this phone most of the time. We've tried un- and reinstalling Drippler, and switching between cellular and wifi, but...

How to Boost Galaxy S7 Cellular & Wifi Reception?

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