There was an electronics store that really did something like that. Think it was Best Buy.
They'd show customers the prices of certain products on their websites, only it would be a different version of the site with higher prices. All to convince the customer to buy the product in-store instead.
Wasn't on a mobile phone, it was on their store computers. Still, pretty similar.
Exactly. Especially with smartphone features like the Amazon.com app, where you can scan a UPC or take a picture of a product, and it shows you Amazon's (almost definitely lower) price for the same product.
I must have been thinking of a different study, there have been multiple studies on this subject. Either way, it confirms that cellphone conversations are more annoying than face-to-face, which was my point.