On Tuesday, Bharti Airtel launched a new limited roaming offer for its prepaid customers in Delhi. The scheme will give the users the advantage of receiving free incoming calls in five states --- Bihar, Uttar Pradesh, Jharkhand, Uttrakhand, and West Bengal (except Kolkata).

In a statement pertaining to the new roaming scheme, Bharti Airtel said that, on a recharge of Rs. 21, Airtel's prepaid mobile customers will now be able to avail the benefit of one month of free incoming calls when they travel to any of the five mentioned states.

According to the company, under its present roaming plan, the Airtel customers in Delhi are currently charged Re 1 each for incoming and local outgoing calls, and Rs. 1.5 for STD calls on roaming.

Meanwhile, in addition to the launch of the new roaming scheme for its customers in Delhi, Bharti Airtel has also rolled out high-quality voice service for its African subcontinent subscribers in Kenya, Malawi, Nigeria, and Rwanda.

Noting that HD voice service will make it possible for customers to talk normally as well as be heard clearly, Bharti Airtel said in a statement: "Airtel becomes the third operator to launch a mobile HD voice service in Africa;" and added: "Further launches will be scheduled in 2013."