First check the stickers on the box which you've purchased. There are places like CV IN , website links for local support which can tell you where the device is from.
The second way is for NOkia devices only.
Go to Settings> extras+info> click on more info and there you will find the Manufacturer name like RM-821_im_India_443 for me. I know it will show EUR for UK and european other countries. In that case you can scroll down even further and check the SAR limits which are country specific AFAIK.
If you can't find it even after that, just not down the Manufacturer name and Google it, it will provide results which are helpful.
Last option, download my apps and give a 1 star rating temporarily, I will tell you where your device is from. The DEV center can show device regionwise ratings.
This is a last option
.. don't screw my apps.