Apple iPhone 5 is not yet available in many countries. But you can buy it from US or nearby available countries. Once you get it and unfortunately if you have any problems with it. Your local Apple Service center wont repair it. You are on your own to repair it by yourself or replace from where you got. If you plan it to do it by yourself here is a great video tutorial by LE55ONS. He is a expert in assembling and disassembling of various latest smartphones. Here is the very detailed 45 minutes video of Apple iPhone 5 Disassembly & Assembly .
Thanks LE55ONS