At&t U-Verse is not available in Sanibel nor (to my knowledge) anywhere else in TV. I called the local AT&T store in LSL just last Friday to ask this same question. They say the signal is sent via the fiber optic cables and Comcast has them under contract.
It appears our choices in Sanibel are limited to BrightHouse, DirecTV and ClearLink/Comcast. I'm not real excited about any of them. We had DirecTV in Ohio and it cost way too much. I switched to my local cable company, bundled my services and saved almost $1000 per year.
DirecTV will bundle but they partner with the local company. See this from the DirecTV website:
Can I get Internet access and telephone service from DIRECTV?
Yes, you can add DIRECTV High-Speed Internet or select a bundled service from one of our DSL and phone provider partners.
If you can not get DSL in your area, DIRECTV High-Speed Internet bundled packages are available to customers through WildBlue Satellite Internet Service. This service is lightning fast, available to virtually every home and small office in America, and very affordable. To order, call 1-800-531-5000.
Post what you decide is best for you. I'm struggling with this decision, too.