I had used Airtel for 2 years as it was provided from company where I am working.
There were so many network issues with Airtel. There was very poor connection at my office area. All the time I had to come outside for calling or to receive calls. Network connection is very bad in city area also. So many times call gets disconnected in between. Also internet connection provided from Airtel was very slow. Most of the times, it keeps buffering. Call charges are ok as compared to other network providers. But they charge more for data usage. Due to this connection issue, I have started using Jio now. You can definitely choose other service provider than Airtel.