Very informative for you to check.
Press the following on your mobile *#06# and the-international mobile equipment identity number appears. Then check the 7th and 8th numbers:
1 2 3 4 5 6 7 th 8 th 9 10 11 12 13 14 15
Phone serial no. x x x x x x ? ? x x x x x x x
IF the Seventh & Eighth digits are 02 or 20 this means your cell phone was assembled in Emirates 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