This is because, in the beginning, these were the only gateway to Jio 4G Preview Offer. "Post April 2016, however, shipments of LYF devices are witnessing a decline and it may not remain a leading brand in the coming quarters. The decline in sales of LYF smartphones is not surprising. In the beginning, buyers thronged Jio stores to get a hold of one its LYF-branded phones, more to get the free Jio 4G Preview SIM cards, than anything else. A large number of Jio phones don't offer enough as far as hardware specifications are concerned, but they were, once upon a time, the only gateway to Jio 4G Preview Offer.

Source: India Today September 09, 2016 08:15 UTC