Vidyarthiplus (V+) - Indian Students Online Education Forum

Simply follow the steps:

1.Insert your sim in 3G Phone
2.Do the following according to your service provider.
Vodafone:

Send a msg sms ACT 3G to 111 wait for
confermation msg and then let it be activated and then choose limits mode for 3G services 

Airtel 3G:

Send a msg sms 3G to 121 wait for confermation msg and then let it be activated and then choose limits mode for 3G services 

Idea:

Send a msg sms ACT3G to 12345 or 3G to 54777 wait for
confermation msg and then let it be activated and then choose limits mode for 3G services 1=mtnl 3G = 1 u have to send a msg to activate 3g on ur sim , insert that sim
in 3g fone then send a msg sms ACT3G to 444 wait for confermation msg and then let it be activated and then choose limits mode for 3G services 

Tata Docomo 3G:

Send a msg sms ACT3G to 53333 or 3GLIFE to 53333 wait for confermation msg and then let it be activated and then choose limits mode for 3G services 

Aircel 3G: 

Send a msg sms START 3G to 121 wait for confermation msg and then  let it be activated and then choose limits mode for 3G services.

Useful post for 3g handsets nice bro.