Currently best spam filter algorithm

Question

What is the currently best method to detect spam ? especially on mobile text message. are there any resource or comparison analysis ?

Answer 1

Why do you need to detect spam post-factum, prevent it in the butt ... again, int the bud ...

Update:
Filters are easily and broadly being used by blackhat SEO/SEm and criminals to blacklist/dump competitors.
Besides, they are retroactive, hence, doomed to always lag behind spammers techniques advancements