- For iOS, Nomorobo is $2 per month. My VOIP service, Ooma, offers Nomorobo for free.
- Truecaller is another one, but they had a data leak some couple years ago.
- I also see one called Mr. Number, and another called "Hiya".
- And finally, there's my mobile service provider, Verizon. They have one that's $3 per month and it sounds like it works the same as Nomorobo, Mr. Number, and the others.
It's difficult to trust any reviews online; most of the publications are names I've never heard of.
Suggestions? I want to be sure that my contact lists don't find their way onto the internet and I'd like to avoid even having my contact lists stored on the service's servers, especially if those servers are located in sketchy parts of the world...