Here is a tip which i’ve got from a blog. i’m not sure about the authenticity of this information, still i’m happy to share it with you. interestingly it worked for me( my mobile is original !!! )

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 ?? | ?? 8 ?? | 9 | 10 | 11 | 12 | 13 | 14 | 15

|———– –+–+–+ –+–+–+ –+—-+- —+–+– -+—+— +—+—+ —|

IF the Seventh & Eighth digits are 0 , 2 or 2 , 0 this means your cell phone was assembled in Emirates which is very Bad quality.

IF the Seventh & Eighth digits are 0 , 8 or 8 , 0 this means your cell phone was manufactured in Germany which is fair quality.

IF the Seventh & Eighth digits are 0, 1 or 1, 0 this means your cell phone was manufactured in Finland which is very Good.

IF the Seventh & Eighth digits are 0 , 0 this means your cell phone was manufactured in original factory which is the best Mobile Quality.

IF the Seventh & Eighth digits are 1 , 3 this means your cell phone was assembled in Azerbaijan which is very Bad quality and also dangerous for your health.