Samsung has got a promotion running in India on the Samsung Learning service found inside Samsung Hub – new users of the Samsung Learning will get a free Rs. 555 voucher that they can use to buy content from the store (mainly textbooks). It's a promotion Samsung had held back in March as well, and to obtain that coupon all you need to do is open up Samsung Learning, after which the free amount will be automatically credited to your account.
There is, however, an odd condition here – you can only use the coupon once, so if you buy a textbook for Rs. 300, the rest of the voucher amount will be null and void. But still, free is free, so go ahead and register in Samsung Learning to grab that free credit, and hurry, since the vouchers are limited in supply.