Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Blocks signal.

This case protects the phone very well. so well that it also blocks the phone signal. if you take it off you get at least one bar more than you had without the phone. and in a mettle building, there is no way you are gonna get signal. i guess it is a good case if you are always somewhere where you get full bars. but i wouldn't recommend it.