Aircel is a good service provider specially for gprs. They are providing good customer care services about giving service details. I am using aircel since 2010 and giving priority of its services over other service providers in delhi and ncr. Its network coverage are very good and call quality is excellent. My call never disconnect during call . Its data services are plans are very good. I have found minus points that 3g services are not available in delhi metro city and in roaming+91 code is not working for calling std calls only 0 is working roaming.