If you are happy with the service in your restaurant, taxi, hotel, or any other service, a tip of 10-15% is an appropriate way to show your appreciation.
Taxis, as in all countries, ask for a rough estimate of the fare before you travel. Ask the driver to use the taximeter and check your change carefully.
Most people including the Turks drink bottled water. On the subject of drinks, Raki is the national drink in Turkey. It looks like water but is 45% alcohol. Don’t drink Raki like beer.
Public telephones have three different systems; phone cards, tokens, and credit cards. Phone cards and tokens are sold at Turkish Telecom offices. Tokens are called “jeton” in Turkish.
When visiting a mosque, dress modestly and take off your shoes before entering. Women may be asked to wear a scarf on their heads.