Comcast in Tucson provides the Cable Service for most of Tucson.
Comcast also offers several other affiliated services such as High Speed Internet and Digital Voice. They have several different "Bundles of Services" available. We just recently bundled our phone service into our Comcast Package and are saving a couple hundred dollars per month on phone service.
A quick phone call to Comcast is all you need to do to set up your account. They will schedule a time to come to your home to connect up whatever services you have ordered. They usually give you a 4 hour window of time when they will arrive.
The Tucson Comcast Office is located at 8251 N. Cortaro Road in Northwest Tucson but we never go there, we just call them. Map
Give Comcast a call a week or so before you want your service connected. Sometimes it takes them a few days to get out to you.