If you're applying for a job at AT&T check the Colorado job listings to see if it's posted there too, they're required to give the actual salary range by law in Colorado, they try to hide it in the job description, but it's there. I haven't seen salaries posted in other states' openings.
You also have to consider that salary ranges are different for different areas of the country, but the Colorado ranges should be in the middle, not as high as CA and not as low as somewhere like Alabama.