https://www.att.com/esupport/article.html#!/wireless/KM1008917
Use the step by step article.
If you have more than one service with ATT, you already have an ID.
https://www.att.com/esupport/article.html#!/wireless/KM1008917
Use the step by step article.
If you have more than one service with ATT, you already have an ID.