First and foremost Its impossible to provide a Phone at that price. The manufacturing cost to make a phone like 251 would be approximately 2000 and the retail price with the companies margin would come to 4000 rs
Now how would one sell a product with such high risk of losses?
Its just spending on the marketing and convincing people to book the phone
Here is how it works atleast 10 lakh people would book the phone and it comes to 25 crores the interest what u get for 4 months is more than enough to sustain in the business
It just a scam