I don't think that the splitting of the batches is related to the interest: The first four batches were delivered before the release date and the last (small) batch less than a month later.
If the first four batches (18800 mobiles) would have been gone so quickly Intex would definitely order more than just another 1200 mobiles. I rather guess that the 20 000 phones was an initial order and that the splitting of batches was done because of other reasons (e.g. production time plans). If the assumptions (and data) are correct than Intex expected to sell at least 20 000 phones (initial order) and those 20 000 are not sold out yet (no re-import until now).


I think the decreasing per unit value is a consequence of volatile currencies. Probably the price was fixed in USD and since June the USD lost a little against the Indian Rupee.