To reach an AT&T Device Support Center, access the Schedule Retail Appointment section on Att.com, and provide the necessary information to make an appointment. Once the Device Support Center receives your request, it should contact you via an email message confirming the details of the appointment.
Navigate to Att.com, click on the Store Locations & Appointments link in the top navigation bar, and click on the Make In-Store Appointment link in the Get One-on-One Help section. Click on the Make an Appointment button, select the Consumer or Small Business option from the drop-down menu, select the Warranty Support option, and click Continue. Type your address, city, state or ZIP code in the Location field, click Search, and select the nearest the AT&T Device Support Center location. Choose an available date on the calendar, and click Continue. Type in your personal information, including name, email address and phone number, and click Submit.
To change or cancel an existing appointment, click on the Change an Appointment button in the Schedule Retail Appointment section, type the information you used to schedule an earlier appointment, and click Submit. Select the Reschedule or Cancel option, and follow the steps to finalize the process. After confirming the appointment, go to the selected Device Support Center, and ask for the desired troubleshooting and warranty services, including battery testing, firmware reinstallation or device replacement.