I bought new SIM card from Vodafone store, which was not activated with 3G service. It was pre-activated with 2G service, but I wanted to get 3G speed. So searched on various website, blog, forums, same as you did.
Finally your search ends, here is some cool steps to activate 3G service instantly* on your newly activated and verified SIM card.
Step #1: Change your Network Mode setting in your mobile to Automatic, so that it can change to 2G or 3G which ever network available.
Step #2: Restart you mobile.
Step #3: Now send message activation from you new Vodafone SIM. “ACT 3G” to 111 (without double quotes) or “ACT 3G” to 144 (same, without double quotes).
Note: If above SMS is not working, please try sending message: 3G<space><your-mobile-number> to 111
Step #4: You will receive two messages continuously.
Enjoy high speed Internet and downloads, Video Calls, Live Mobile TV, HD Gaming with Vodafone 3G. We have your request for 3G service and will revert shortly
After awhile, you will receive second message
3G services on your phone will be activated in 24 Hrs.
Note: In-case you receive any error message for using wrong keyword, as I got, try send same message to 144 it will work out.
Step #5: Now wait for 10 minutes so that your request will be accepted and changes to propagate in Vodafone server. After a while again change you Network Mode settings to UTMS.
Step #6: Now keep you mobile with SIM card switch off for 5 minutes and start it. Now you start data connection, and you will see 3G network working in your mobile phone.
Hope you are happy with our tutorial on activation instantly.
Read Similar: How to access 3G browsing speed in 2G data plan ?
[* I used word Instantly, because generally it take one day to activate. In this case it takes 15-20 minutes]
Photo Credit: Vodafone India
Note: New Vodafone SIM cards are already 3G enabled.