Funny what you can learn from your children. I was out yesterday with my teenage daughter shopping. She left her backpack in the car, but brought her cellphone with her. In 1 hand. Because she didn’t have pockets in her shorts. So she couldn’t carry anything in that hand.
Now, think about this when you go out. It was broad daylight and we weren’t expecting any problems. But she had 1 hand full. So she was effectively 1 handed. This isn’t a good idea. Carry your phone etc. in a pocket or pouch. Put it where you can get it easily. Take it out when you think you need it. But not otherwise. Sometimes you need *both* hands to protect yourself.