7 Must-Have Apps for Salespeople

Inc.com
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Sell with a swipe.

After you sign up for Square, the company will mail you a free card reader that plugs into your phone and scans credit cards. Square lets you accept payments from Visa, American Express, MasterCard, and Discover credit cards for a flat rate of 2.7 percent, and deposits show up in your account the next day.

Square, by Square Inc.
Available for: iPhone, iPad, and Android
Cost: free