Got back from vacation overseas and found out my number wasn't working. Opened a ticket and was told the number was ported out to AT&T Mobility, which I never authorized. I don't even have any AT&T account. Carrierlookup.com shows that the number is an AT&T number. I was told by support to submit an LOA form to get it back. Did that and now crossing my fingers that they will be able to recapture my number, given that wireless numbers are usually PIN protected.

Question is, how could have this happened? Level 3? Has this happened to anyone else?