Do you have to have cell service to run an app on the iPhone 4? If so that sucks cuz I don't get service in a lot of areas I hunt. I've been preloading info into the on-line version of jbm and saving the drop chart as a photo on the phone but when the conditions change it's useless. Also which iPhone app do you recommend? Someone mentioned shooter was available now for the iPhone but when I did a search for it nothing came up? I am leaning on the bullet flight by runaway tech. My brother uses it and loves it. It looks very user friendly and has a ton of factory ammo saved into it which I like. I would by the $29.99 version.