From the ATT.com home page, click the support link in the header of the page. This takes you to the AT&T support center, which allows you to choose the service for which you need technical support. From here, you can click the call us link found in the upper-right corner of the page.
Click the link that represents the appropriate service type. This will populate a list of contact numbers, including technical support, from which you can choose.Learn more about Mobile