Before trekking out on a midnight lockout call it might be a good idea to first get the customer's charge card number as an offer of sincerity. But how do you know if it's a valid number? Now you can "pre-qualify" a credit card number that you receive over the telephone. It doesn't guarantee payment but it does tell you if the credit card number is a valid one. The Free Treskat Locksmith Demo, available at
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