In a bid to take on its rivals, telecom giant Bharti Airtel has launched a new prepaid recharge plan for users with unlimited voice calls apart from data and SMS services, according to media reports. The new recharge plan, which is not yet updated on Airtel's app, costs Rs 597 and comes with a validity period of 168 days. The new plan is bundled with several offers --- 10 GB data, unlimited voice calls and 100 SMS per day. However, this new plan will be available in select cities at launch. A user should check for availability before going for it.