Press the following on your mobile *#06# and the-international mobile equipment identity number appears. It is a 15 digit serial number. Then check the 7th and 8th numbers:

IF the Seventh & Eighth digits are 02 or 20 this means your cell phone was assembled in Gray market which is very Bad quality

IF the Seventh & Eighth digits are 08 or 80 this means your cell phone was manufactured in Germany which is fair quality

IF the Seventh & Eighth digits are 01 or 10 this means your cell phone was manufactured in Finland which is very Good

IF the Seventh & Eighth digits are 00 this means your cell phone was manufactured in Original factory which is the best Mobile Quality

IF the Seventh & Eighth digits are 13 this means your cell phone was assembled in Azerbaijan which is very Bad quality and also dangerous for your health