
In many urban settings there are crazy people with mental disorders, drug or alcohol problems and criminal records or warrants out for their arrest (which can lead to insanity, or poor decision making).
In some instances they begin talking to themselves or the Sky as it appears.

When you are using a Mobile Phone it’s best to declare that you are using the Phone lest you may appear as one of the ‘Crazies’ talking to themself. Meaning don’t use an earpiece in Public because people might think you are talking to them. And waltzing around like some half-wit making eye contact with others while pretending to be on the phone or using some type of earpiece for the Phone while on the phone is dangerous because you will by many whom are keen be mistaken for a local crazy who talks to themself.
Then you may run into a crazy who talks to themself (they rarely make eye contact and if they do, it’s best to avoid) and you can wind up getting killed on the spot.
When in public it’s best to ‘declare’ that you are on the phone. Meaning hold the phone to your ear and be mindful of your surroundings.
It’s in very poor taste to use the phone when entering places of business. Retail stores, restaurants, offices, banks, etc…
Then there is the use of the camera phone (which a very strong case for being banned can be made). You should be aware of where you point the lens of a camera at all times, even if you are a low tier human, or some criminal with no money or future plans, because some people might confront you for where you point the camera. I.E. – at young children, someone’s wife or girlfriend, in a strip club at a stripper, at the police.. all bad ideas.

It’s very easy to get hurt or killed in most urban settings, because people will be in these settings, and people are mostly poorly raised, and without class or know-how.