From the comfort of your home via your personal computer, quickly and easilycompare prepaid calling cards that are ideal for calling to any country worldwide. Most calling card retailers offer multiple cards for you to compare by displaying them in an easy to read top-down format, which aligns card details, rates, and available denominations.
After finding the right calling card for your needs you can buy it within a few clicks. Leading retailers make your purchase secure and easy by offering trusted payment options like PayPal or Google Checkout, in addition to credit cards or debit cards. Some even allow you to purchase with a money order or personal check. Upon approval, your calling card PIN and dialing instructions will be sent to you via email and posted to your online account for future access.
TIP: Before purchasing a calling card from any online retailer, look for trust symbols and seals related to safe shopping (i.e. Verisign), business associations (i.e. Better Business Bureau), guarantees and even third party security partners (i.e. McAfee Secure).
TIP: Research indicates that most advertised rates are based upon exhausting all available minutes on a calling card in a single call. If there are not any minutes left, on a calling card then the carrier cannot assess any additional fees; fees directly reduce the number of available minutes on a calling card. As such, customers should consider purchasing the lowest available denomination, which will allow them to enjoy their conversation and exhaust all available minutes in one phone call. If you plan to leave minutes remaining on your calling card, consider purchasing one with no fees beyond the advertised per minute rate. These are known as “clean calling cards.”
TIP: Consider buying a calling card from a retailer that clearly publishes customer support and contact information for the carrier and themselves. It’s also a good idea to find out if a guarantee is offered. Do not settle for anything less.
Source: http://speedypin.com/phone/card/articles-3reasons-to-buy-calling-card-online-vs-over-the-counter.html