Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cell signal booster works!

Product works as advertised. Had a crappy (1 bar) connection inside my rural home. Dropped calls routinely. After installation (on my roof), I have 3-4 bars in half my 1800 sf home and 1-2 bars in other half (farthest from indoor antenna).Haven't had a dropped call since install.