BTW From T&C:
(b) The JioPhone is available for continued use on the Recipient purchasing telecom recharge vouchers of an Authorized Carrier (presently Reliance Jio Infocomm Limited) from the Company or any of its authorized retailers for use in the JioPhone of a minimum value of Rs. 1,500/- per annum for a period of 3 years from the date of the first issue of the JioPhone.