You may check the specific daily prepaid recharge offers, one year plan of Bharat Sanchar Nigam Limited introduced in circles like Tamilnadu, Kerala, Karnataka, Gujarat, Maharashtra etc
BSNL Recharge Plans and also find BSNL all India free roaming facility including Mumbai and Delhi by allowing new prepaid mobile plan with unlimited data and calls, free SMS, even in roaming, and to attract more customers into their web.