UPDATE:
Want to update every1 who is using or will be using airtel direct. after recharging with unlmtd 2g pack choose 3g pack which also gives you night data like 186rs in delhi in which you get 400mb day/night + 400mb night and setup the trick in day time. Once setup download unlimited in day and don't use internet between 12-6AM and this way you will retain 400mb night data due to which signal will not get lost. This is sureway to avoid signal lost because sometimes even after setting the trick signal gets lost.Most of the time signal is lost when every data is 0MB.
Want to update every1 who is using or will be using airtel direct. after recharging with unlmtd 2g pack choose 3g pack which also gives you night data like 186rs in delhi in which you get 400mb day/night + 400mb night and setup the trick in day time. Once setup download unlimited in day and don't use internet between 12-6AM and this way you will retain 400mb night data due to which signal will not get lost. This is sureway to avoid signal lost because sometimes even after setting the trick signal gets lost.Most of the time signal is lost when every data is 0MB.