If you are on an iPhone, and want to prevent thieves from snatching your phone and using it to steal from you, this dead simple trick is invaluable:
Normally your phone only requires a pin or FaceID when you unlock it, but if they steel your phone out of your hand, then they get your phone unlocked and can access everything.
Fortunately, this is easy to prevent:
1. Hold your finger down on any sensitive app you have: Banking, payment, e-mail, etc.
2. Select "Require FaceID".
That is it.
@randahl ...or you could just have a phone that looks so shabby that no one will think of stealing it. I will NEVER give Apple, or any other company, my fingerprint, iris or face.