How to activate 3G services (All networks)

Enlisting the sms codes for all networks to activate 3G services

Vodafone:-
SMS
ACT 3G to 111
Airtel
Sms
3G to 121
Idea
Sms
ACT3G to 12345 OR 3G TO
54777
Tata Docomo:-
SMS
ACT3G to 53333
OR
3GLIFE TO 53333
Aircel
Sms
START 3G to
121