"Calls will be free for lifetime" - Only if you subscribe to any plan & will be free till that particular plan is active on your phone. Without any plan it will be chargeable as per base rate if you have talk time balance in your account. After taking Prime membership you are switched to Plan 149 by default and your membership will get activated only if you recharge with ₹149/- or higher voucher.
So to avail unlimited Free voice calls some plan has to be active on your phone for outgoing calls.
A SIM can receive incoming calls (only local & not while roaming I believe) for a maximum of 90 days after which it will be at the liberty of Jio to decide whether or not to terminate your connection as mentioned in their term no. 6 below.
6. SUSPENSION/DISCONNECTION/TERMINATION
Notwithstanding anything contained herein, RJIL shall be entitled to suspend /terminate the Service/s (whether temporarily or permanently) to recover all outstanding and dues from the Customer, without prejudice to, and in addition to any right or remedy available to RJIL, under any applicable law, if:
The License is suspended / terminated temporarily or otherwise vide Governments, Court's orders, TRAI's rules, regulations, orders, directions, notifications etc., including changes thereto prohibiting and/or suspending the rendering of such Services.
Transmission limitations caused by topographical, geographical, atmospheric, hydrological and/or mechanical conditions.
During technical failure, modification, up gradation, or variation, relocation, repair and/or maintenance of the Network/equipment.
To combat potential fraud, sabotage, wilful destruction, etc.
If Service is used in any manner, which violates any law or Government order/directions etc., or adversely affects or intervenes in any manner, the rendering of Service by RJIL
If at any time the Customer fails to satisfy requisite credit check or provides incorrect or misleading information in the CAF.
At any time the Customer fails to pay charges due on or before the due dates.
The Customer is in breach of any other provision of these terms and conditions or is declared insolvent /bankrupt /liquidated /dissolved or a Trustee or Receiver is appointed to take over the assets of the Customer.
Any other reason which is found to be reasonable by RJIL, warranting suspension/disconnection.
The provisions of Service/s (or any of them) to the Customer adversely affects the Network or equipment of RJIL or the provision of Service/s to the Customer are revoked, discontinued or suspended.
As per government regulations, for connections without any usage (voice/video calls, Outgoing SMS, internet usage, VAS purchases with balance) for 90 days, following actions are liable to be performed by RJIL: 1) For subscribers with less than Rs. 20 balance, all services will be deactivated pending payment of Reactivation fee for a period of 15 days. Number will be disconnected on non-payment of said Fee within this period. 2) For subscribers with more than Rs. 20 balance, Automatic Number Retention Scheme will be put into effect- Rs. 20 will be deducted and services will continue for 30 days. If there is no usage till the end of this period 1) or 2) may come into effect, depending on balance
Usage of Equipment by the Customer for which IMEI codes are not traceable or valid on RJIL Network.
Any re connection of service/s shall be done at the sole discretion of RJIL and fulfillment of other conditions as specified by RJIL.
The Customers shall remain liable for the charges during the period of suspension of services.