To find out how to set up ATT mail on iPhone, you are supposed to follow and apply a few important instructions. You can go through the steps. From the home screen, and then select the mail app. Now, you should select the desired email provider, and then you are supposed to enter your email address and then select the next and then enter your password and then select next. Now, you must set the desired account sync options and then select save, and your email is now set up in the mail app.To find out how to set up ATT mail on iPhone, you are supposed to follow and apply a few important instructions. You can go through the steps. From the home screen, and then select the mail app. Now, you should select the desired email provider, and then you are supposed to enter your email address and then select the next and then enter your password and then select next. Now, you must set the desired account sync options and then select save, and your email is now set up in the mail app.