Airtel Delhi keep changing it’s 3G cum 4G pack. The one we are talking about is standard 1GB pack which was Rs.255 for many years then increased to Rs.299. However it didn’t get well for the existing customers or maybe due rival like Idea Cellular who reduced it to Rs.255 again. So Airtel followed up Idea like it did previously while increasing rates. And its back to Rs.255 now again increased to Rs.279 sometimes 299 and few times Rs.255 also. Maybe whatever it can hang customer to buy. Just testing the waters.