said by link626:TWC website says it can take up to 3 weeks to port your number, but I find that hard to believe.
Has anyone ported their number from ATT? How long does it typically take?
You have to establish your new service first, then Port your Number. If you are going to have TWC Digital Phone, just follow the instructions on their Web Site. First you have to find out if your Number is Portable. You have to go through your new Provider to Port your Number, that will disconnect your Phone from AT&T. So the Time Line is set up by your new Provider. It's all mechanized and orders have to be put in to build your Phone Number to the new Provider. If you disconnect from AT&T first, your Number is gone and it doesn't belong to you anymore.