On my hmd skyline i am degoogling. My dialer and sms messenger are all google apps anders i am assuming google is tracking the metadata. I have replaced my dialer with simple dialer and the sms service with QUIK SMS. However, i was wondering if there are any spam filtering apps i Can use that Will keep me safe? should I answer? Seems To Be The best But it is not FOSS. Can i trust it?

Thanks in advance!