Warid has launched advance balance service, or also known as loan, for its prepaid customers with which, those customers who get short of mobile credit can refill their account with advance loan and return it whenever they recharge their accounts, It merits mentioning here that Warid Advance loan will be given away only if your credit reaches below Rs. 5 (US$ 0.05).
Source: http://italk.pk/post/2012/02/29/Warid-Offers-Advance-Loan-Balance-Service.aspx
