iphone update 2.2.1

Hi Apple Team,
I am using iphone 3g v 2.1. Original
Few games are not downloading saying that not compatible.
My question is if i update to 2.2.1 will i be able to play all those apps.
also i am from india if i update to 2.2.1 will i get baseband issue and No service......
because i read in most of the forums that if u update 2.2.1 u will not get signal and u will only see no service.....
Once again i am from india ... my mobile bought in india and still in warranty........
please solve my issue as soon as possible
iphone Windows Vista