Beginning today, Sprint data subscribers can use the new Mobile Shopper service to buy products from 30 online retailers directly from their phones. Users can search, compare prices, check inventory, email and share item information, as well as make a purchase. The tool is accessed by typing “shop” into the Sprint web browser. Users must set up an account tied to a credit card, which can be done from their phone or on a PC. The service itself is free to use.