SMS Shield is described as 'Machine Learning-based SMS spam filter for iPhone. We trained it on what spam SMS looks like by showing it tens of thousands of spam SMSs beforehand. SMS Shield then learns and, to a high degree of confidence, can identify spam even it haven't seen it before' and is a Anti-Spam tool in the security & privacy category. There are more than 10 alternatives to SMS Shield for a variety of platforms, including iPhone, Android, Android Tablet, iPad and Android Wear apps. The best SMS Shield alternative is Filtera. It's not free, so if you're looking for a free alternative, you could try Truecaller or Calls Blacklist. Other great apps like SMS Shield are Hiya, Mr. Number, WhatSpam and Dont Text.
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