Hi I'm from India have got iPhone 2G reently from my friend in US. I've unlocked it and upgraded to firmware 3.1
I want to use internet on my iPhone through cellular data network. I have inserted TATA DOCOMO network sim card and I'm able to access internet.
Now, I'm not using TATA DOCOMO any more. I've inserted vodafone network sim and cellular data network is not there when I go to Settings--> General-->Network. How can make this option available? Please help me out.

Thanks,
Sree Prakash Allu