Hi, Michele.

I went through a similar scenario when my husband and I received joint AMEX Jet Blue cards. We were approved online (since that's how we applied), and the cards arrived in the mail. Nearly a month after receiving the cards, we received a letter much like the one you described, stating that they had been trying to call us and the account was being "frozen" until we call to speak with them. Our home phone number is unlisted, and we have a privacy manager, which prevents unknown or private callers from ringing through to us unless they identify themselves first. This was apparently a big problem for them, because they refused to identify themselves as American Express when the recording prompted them to do so. So after receiving the letter, my husband called and provided them with the peace of mind that we exist. The woman he spoke with told him that they do this for everyone who applies for a credit card online. Seems to me it would've been helpful to complete this process BEFORE sending us the cards and allowing us to activate them; but I digress. If it makes any difference to you, we've been very happy with their services other than this initial experience.