[header] How to activate a visa credit card [title] Call the activation number. [step] When you receive your new credit card in the mail, it should have a sticker on the front that will explain how to activate it by either calling a phone number or going to a website. Locate the number and dial it using your phone. 
[substeps] Ordinarily, the phone number will be a toll-free number, such as an 800 number. Depending upon your card issuer, you may only be able to call at certain times, such as during regular business hours.