What are the top apple apps to block spam on your phone

It's not an app but Silence Unknown Callers works perfectly for my needs. See: Detect and block spam phone calls - Apple Support

nanabren123 wrote:

Top apple apps to block spam phone calls

Check with your carrier. Some carriers have apps that can identify and block some spam calls (it is impossible to block all spam calls because many can’t be distinguished from legitimate calls). Other than that the best that I have found is the original, nomorobo, which is also available for VOIP landline phones.