o know the steps for ATT email settings iPhone, here’s what you have to do: From the iPhone home screen, choose Settings. Choose mail. Choose accounts. Select add account. Tap to Yahoo. After that, enter the email address and choose to next. Enter the password and tap next. Select the information to download to your iPhone by clicking the sliders next to mail,contacts, calendars, or notes. Lastly, choose to save.It is advisable to follow the steps for ATT email settings on an iPhone device. Follow thesteps properly to fill the email settings appropriately.