Turkish area code 543 (or +90 543 in international format) is a mobile phone prefix. It is primarily assigned to Vodafone, but with number portability any specific number could be served by any carrier.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The country code and area code of Winterswijk, Netherlands is 31, (0)543.
The country code and area code of Chakwal, Pakistan is 92, (0)543.
The country code and area code of Tambul, Sudan is 249, (0)543.
The country code and area code of Binzhou- SD, China is 86, (0)543.
The country code and area code of Adana, Turkey is 90, (0)322.
The country code and area code of Adiyaman, Turkey is 90, (0)416.
The country code and area code of Afyon, Turkey is 90, (0)272.
The country code and area code of Agri, Turkey is 90, (0)472.
The country code and area code of Aksaray, Turkey is 90, (0)382.
The country code and area code of Amasya, Turkey is 90, (0)358.
The country code and area code of Ankara, Turkey is 90, (0)312.
The country code and area code of Antalya, Turkey is 90, (0)242.