This what they have posted on their site. its nice and convenient.
Quote:
Premium Messaging Content: Premium messaging campaigns are sponsored and run by third parties. These campaigns vary, but the most common allow you to either vote on television programs or sign up for text alerts and chat services. Standard messaging charges apply and many campaigns also charge additional premium fees.
The campaigns available to U.S. Cellular subscribers are listed below and are searchable by short code used for the campaign, or by campaign name/keyword.
U.S. Cellular does not guarantee message delivery or timeliness. 150-character limit per message for text messaging. U.S. Cellular not responsible for content of messages. Premium text messaging charges apply plus standard text messaging charges of 20¢ per outgoing message (if no messaging package is selected or existing package limit is exceeded). By using text messaging you agree to be bound by all terms and conditions at www.uscellular.com/Messagingterms.
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link:
http://www.uscshortcode.com/