i just got an iphone 3g from a friend, and previously i put my sim card into it, i want to know will the internet always be on? better yet i know u can shut bad 3g, but do the stocks and weather apps always update automatically, or only when you touch them?Try to look for more information here: http://buy-3g-iphone.com
Very descriptive site next to many info...
Hope i could help.