I've activated my net package on my iPhone 5 and it's not working?

I've activated a 3G scheme on my iPhone 5 and I just got the message from Vodafone that your data pack is active now and valid upto 1 month, and I can't browse the web, I've turned on ENABLE 3G and CELLULAR DATA though.

Hey try to set it mannually
coz almost all new phones works well only doing manual setting

After activating 3g switch off your phone and turn on again it will definitely work