Click on this link to find your nearest Apple Authorized Service Provider (AASP) --> https://locate.apple.com/country or see if you can find any service locations in https://locate.apple.com/findlocations Some places with limited support may be included in the "other" link at the bottom of a region selection.
If you bought thre device in another country, note this section from the warranty documentation:
http://www.apple.com/legal/warranty/products/iphone-english.html
Note this statement from the iPhone and iPad warranty:
"IMPORTANT RESTRICTION FOR iPHONE AND iPAD SERVICE.
Apple may restrict warranty service for iPhone and iPad to the country where Apple or its Authorized Distributors originally sold the device."