Truecaller had a weird response on my S7 Edge. I went through a lot of different apps, and found that "Should I Answer?" works the best without any ads, premium service, or any real impact to the actual interface of the caller. The only thing it really changes is it notifies you who is calling you in the sense that if the community has labeled the caller a telemarketer, it will tell you how many people in the community labeled the phone number as such. Otherwise, you can block callers through the app, so that would solve your issue with blocking calls with a respectful app and not messing with the interface of your phone at the same time. Two birds. One App.