→ How to increase call speed ? Call fast even when the network is busy, this trick is applicable for all mobile networks including Airtel,Aircel,Docomo,Idea,Bsnl,Reliance,Vodafone,Uninor,videocon,Virgin and so on.
To try this follow some simple steps:

1 call to balance enquiry number(eg:123 in Airtel)

2 now press hold
dial the number that u want to call

3  You are done,your call will be connected without any network delay.