I use ShopSavvy personally, and I’ve used it to scan a UPC code in a store, and compare it’s price between b&m Target, Walmar,t and against Amazon, etc online prices.
It grabs b&m store prices listed online based on what other stores are around me, and tells me their posted prices as well as popular online store prices, which I then compare with what I’m standing in front of.

Did i read iPhone??

Contacts: Every contact I enter in my phone or email account is synced to both places – names, addresses, birthdays, notes, etc. If I lose my phone, I never lose this information. Contacts are grouped in tabs, like the ones in your browser – friends, business, family, etc.

Voicemail: Callers should hear a custom message depending on who they are: business contacts hear me being professional, friends hear me being silly, etc. When I have messages, I should see an inbox listing the messages and be able to pick and choose what I listen to.

Access control: I give out one phone number which can ring to any/all of my phones, and I chose who can reach me where and when. If I go to bed, all callers get a message saying “I’m asleep;” friends and family have the option to wake me in an emergency. New callers get screened and I’m prompted to classify them as business, friends, etc. Annoying callers get marked “Spam” and are blocked.

Customization: I can set shortcuts for any function in my phone and get to it in a couple of key presses. Voice memo, calendar, silent mode, calculator – whatever is useful to me.

To me, these are all fairly basic things that phones should be able to do. The phone is PRIMARILY a communications tool. Sure, it can be a camera, personal shopper, toaster, etc, but its primary job is to let me get in touch with people and let people get in touch with me with minimal hassle. And it should go without saying that every phone should have excellent call clarity, speakerphone function, etc before you even start trying to add a video-enabled social reality tagging treasure hunt shopping experience.

If we start adding extras, my first choice would be:

Navigation: My phone should have GPS and give turn-by-turn directions from Google Maps. All map information for a trip should be cached at the start in case I lose service along the way. The physical addresses of all my contacts are easy to plug in for directions. (This seems like a gimmie, since GPS signals are free and most phone can access the web. Why should you pay a monthly fee for navigation services?)