Do NOT download Scam Shield on your Phone: it's a T-Mobile scam!

That has not been my experience.  I just looked through my logs back to Nov 1, as far back as the logs go and they tell a very different story.  23 probable scam numbers were not detected.  Some of those were definitely scams, all of them were probably scams.  3 calls with faked caller ID information were not detected, but were scams.  Unless, that is, Progressive calls me to thank me for my patronage to Marriott Hotels.  5 numbers actually in my contacts were detected as scam likely.  Only 5 calls not in my contacts and without caller ID information were detected as scam likely, and one of those wasn’t a scam.

It may be working for you, but that doesn’t mean it “works great” in general.  Bottom line, it has access to my contacts but STILL blocks numbers in my contacts as scam likely, it let through 26 numbers which were certainly or almost certainly scams, it detected 5 numbers which were definitely not scams and were in my contact list and it detected only 5 actually questionable calls, at least one of which was not a scam.  That’s well under 20% accuracy.

This isn’t my opinion.  It’s not a guess.  I’m not just saying it doesn’t work because I don’t like it.  My actual call logs show this program just doesn’t work.  It literally detected exactly as many numbers from my contacts as it did unknown numbers.  Just 10 detections in 3 months, fully half of them people I definitely know, while letting nearly 3x that many actual scam calls through.  If you don’t want to talk to your mother-in-law then yeah, it’s great.  Just get her a cell phone on a different cellular network and turn on Scam Shield and you’ll never even know she called unless you check the Scam Shield logs.  Otherwise, it’s just not that useful.