What is the best spam blocking, free, app for Apple iPhones?

The op is asking how to block spam PHONE CALLS. Answering about sms or email spam is off topic. In fact no answer is provided because there is no way to block calls other than blacklisting manually every single unwanted caller or filtering all but saved contacts. Neither feature is really useful to filter spam. A feature such as blocking numers starting with +44 or +213 or whatever would really help. That's not available in IOS and I didn't succeed searching an app doing it. Apple please provide it rather than spending on embellishing icons!

Hello Manmoon9677,

Thank you for using Apple Support Communities!

We understand from your post that you would like to know which app would be best to block spam on an iPhone. What type of spam are you trying to block? If it is spam phone calls this article has information which may help:

Detect and block spam phone calls - Apple Support

If it is spam text messages, this article has information on how you can report spam or junk messages:

Block, filter, and report messages on iPhone - Apple Support

If it is junk email, this article may help:

Identify and filter junk mail in iCloud - Apple Support

To block FaceTime calls, check out this article:

Block unwanted callers in FaceTime on iPhone - Apple Support

Best Regards.