Airtel opretor system was nyc when it was in a 3g or 2g handset phones and now days the airtel sim has also los its capacity any where its becomes slow to use internet and when firstly it was considerd as a 4g hand set the it gives us better internet and now it give us very slow speed of internet and now days it is because done by the many operator who h port there sim to idea to airtel and jio to airtel because of much user the airtel is providing slow speed of intenet and one more reason it that the airtel users are me behaving to therr internet so the is giving slow speed but one thing us that the best sim is to say to airtel only love u airtel