Update:- After serious threat to leave the connection and uncounted experiments by airtel executives i can confirm than my line has became stable from last 1week.
possible reason for disturbance might be malfunctioning phone instrument or the port in the junction box.
as they changed my instrument & changed my port in junction box in last day.
i was tried hard to get beam cable in this period, but i must say they doesn't care about getting new customer.
after applied for connection online & phone call, got a callback from them after 7-10 days. and directly asking "cheque ready hai "? :O :O
asking for money without any details or whatever .... WTF??
The attitude of the executive in phone is like, i have borrowed money from him & he is threating me to return
do i have decided to stay away from them & will bear Airtel untill Hayai spread their wings in Hyderabad.
Yeah my humble opinion stick with Airtel, Beam is no way that good in uptime or reliability when things go wrong they simply cannot provide proper support and you net might be down for a couple of days.