Credit cards may soon be as outdated as vinyl records. (Remember those?) And this is the year that the slow, steady march to oblivion begins.

You can already use your iPhone, Droid or BlackBerry to buy a hotdog at the ballgame, buy your Starbucks latté, or give a friend a few bucks by Bumping phones. But by the end of the year you may not even think twice about reaching for your phone to pay at the register instead of fumbling for your credit card.

While companies have been experimenting with contactless mobile payments for years, 2011 is expected to be the year the technology really takes off. That’s because millions of phones capable of making contactless payments are expected to be shipped out in 2011.

As a result, this pay-by-phone market is forecast to make up $22 billion in transactions by 2015, up from “practically none” last year, according to research firm Aite Group.

Companies including Visa, MasterCard, Google, Bank of America, Citi and U.S. Bank are all testing contactless mobile payments, and many expect to roll out mobile wallets this year.

“2011 is going to be a very exciting, very dynamic year when it comes to mobile payments because it’s the Wild West again, with all these players positioning in various different ways to redefine the digital payments landscape,” said Michael Upton, senior vice president of online and mobile banking at Bank of America, which expects to launch it own mobile wallet later this year.

Meanwhile, AT&T, T-Mobile and Verizon joined forces with Discover and Barclays in November to form Isis and provide a rival to Visa and MasterCard.

(Source: CNN)