According to the local rules of etiquette, making phone calls after 21:00 is prohibited. However, morning calls are very usual here, so you are free to call from 7 o'clock in the morning.
You should be quiet on the streets and in public places of the city. Any violation of public order, whether it is just a loud cheer or active gestures, can be considered as a sign of bad education.
Don’t forget to refer your new acquaintances by the last name only. When you tell your name for the first time, you must always tell your last name, or you can put your interlocutor in an awkward situation.
1 Local people are very punctual, so do your best not to be late for meetings. It should be noted that there are always big traffic jams in the evening on the main streets of the city, so it is better to leave earlier for important meetings.
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