Hello dvartzikos, the phone plans paulgarcia posted are the Voice services U-verse offers. You can change your plan by going to att.com and log in on the right side of the page using your registered Primary Member ID.
After you log in, In the Overview screen go to Home Phone and select "I want to" scroll down and select change plan
You will see your available plans to select
You can also let us know if you still need assistance changing the plan and we will contact you to ensure you get the plan you are requesting. If the above information resolves your issue please mark an answer correct so we can know you do not need further assistance. :smileycool:
If you encounter any issues with your service or equipment, I recommend checking out our Troubleshoot & Resolve solutions to help diagnose the issue.
*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.