Using mobile phones in Turkey, you might endup with massive bills soon as you back home but if you have an "unlocked" GSM phone capable of operating in the 900 Mhz or 1800 Mhz bands, you can probably use it in Turkey but you must register a foreign phone with the Turkish authorities before you can use it. You can use it via international roaming, but a cheaper way may be to buy a Turkish SIM card (chip) and insert it into your phone and you can get Turkish Sim Card and use it while you are in Turkey and most commnon and as knowing as a best covereg areas network is Turkcell and Avea in Turkey this days also more secure with nice costumer services which is very important if you have problems and also has a shops all over the Turkey so we would highly recommend that you get Turkcell or Avea while you are in Turkey
A SIM card is a small electronic chip and memory card that stores information on a mobile phone customer, the phone's account, country of usage, and data such as SMS messages. In effect, it's the "hard drive" or "memory chip" of your GSM mobile phone. When you turn on your mobile phone, the SIM tells the phone which network to connect to, who you are (so people can call you), and your phone usage preferences. Several companies will sell you SIM chips from Turkish mobile phone companies in your home country, so you'll be able to set up your phone before arriving in Turkey, and make and receive calls as soon as you arrive and register your phone. Otherwise, you can easily buy a SIM card when you get to Turkey.
If you GSM phone is unlocked, you will be able to remove (and save) your current card, buy a new Turkish SIM card, insert it in your mobile phone, and use your phone as a "local person," paying local Turkish rates for calls. This is usually much cheaper than international roaming. In Turkey, a mobile phone shop—they seem to be everywhere in the cities—may be able to "unlock" your "locked" GSM phone so that you can put in a Turkish SIM card. They may charge TL10 to TL50 for this service. Mobile phone shops will also sell you prepaid "starter" packets from any of the Turkish mobile phone companies.
The packet contains a SIM card, phone number, description of services available, and instructions for use—all of which may be in Turkish! But the shop clerk should be able to help you. For my Turkish-bought phone, I just removed the back, took out the battery, inserted the SIM chip, replaced the battery and the back, and then sync'ed the phone with the network by pushing the buttons as instructed.
With a new SIM chip, you'll probably have to re-program all the phone numbers you want in your phone (because the SIM chip is where your numbers are stored). Making calls is usually pretty easy to figure out, and the phone shop staff will help you with that, too. Here's some help.
If all else fails, Turkish mobile phone companies have customer service numbers that connect to English-speaking operators who may be able to help you. Turkish mobile phone companies make it easy for you to add calling units (kontör) to your account.
For more information you can always search Google, Yahoo or Msn Bing and Alexa for Turkcell or Avea and get all the informations you need.



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