Some companies that offer free 10-minute calling cards are CallingCards.com, MobileCaller.com and BestRatesCall.com. The free calling cards from CallingCards.com let customers call any phone number, including mobile phone numbers, in the world. To register, navigate to its website, click Get Minutes on the page, and fill out the registration form.
MobileCaller.com offers free trial of its pinless dialing service, and with the free trial, customers can call any phone number in the world for 10 minutes. To sign up for the free trial, navigate to the company's website and fill out the form on the page.
BestRatesCall.com also offers 10-minute free trial of its international calling service. Customers can sign up for the free calling minutes by clicking the Sign up link at the bottom of its website.