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I use the Android messaging app and turn on spam protection. Whenever I get a text message from someone not in my contacts, I have the option of marking it as "spam" and blocking the number or adding the name to my contacts. Offending spammers will change their number but I found if I keep marking their messages as spam and blocking them, eventually the spam messages go away.

To block spam phone calls, I use an app called "CallBlocker" with a "white list"; i.e., it will send any call from someone not in my contacts to voice mail without even ringing my phone. I can always add callers to my contacts to prevent them from going to voice mail in the future.