The radio taxi are available throughout the NCR and the same can be available just on a phone call like:
Delhi Cab: 91-11-44333222
EasyCab: 91-11-43434343
QuickCabs: 91-11-45333333
Meru Cabs: 91-11-44224422
Mega cab: 91-11-41414141

Generally they charge around 14 rupees per km in the NCR region. The cabs are generally with AC and they can travel from delhi to UP and Haryana also.