@Hitman the problem lies with vodafone only. i reside in west delhi(rajouri garden), as per your post vodafone 3G should be available but since officially it's available in only three areas i can't activate 3G coz for 3G to be activated i have to recharge with 3G coupon, since i cant recharge thats why i cant get signal(network selection mode in phone)Thats why i was saying 3G isn't available in west Delhi.