What is the proper procedure for porting an AT&T digital phone (*not* wireless) to another carrier and cancelling AT&T service?

1.  I successfully ported the old landline VOIP number to a wireless carrier.  I initiated the port with the new wireless carrier.  Porting was complete within three business days.  (It took awhile for my cell phone to receive incoming calls.  Although the cell had active service with the new wireless carrier, incoming calls to my old landline number still caused my house landline to ring until porting was finally complete.)  Porting did cancel my AT&T home phone service without my contacting AT&T.

2.  Removing home phone service did dramatically affect the price of my AT&T internet service.  I incurred a significant price increase.

You contact the carrier you wish to port to. If the number can be ported, they will port it. Porting the number will cancel that line on ATT.

Just don't cancel your AT&T account until the port is complete. 

Thank you for the replies.  Two questions:

1 - Does porting automatically cancel my AT&T phone service?  Or after the port is complete, do I still need to contact AT&T to cancel that line?

2 - I have AT&T internet service: "AT&T Internet Basic 6".  When I bought it in 2015, it was bundled with my digital phone.  They were both purchased together through AT&T U-Verse.  They do appear as separate services on my one/single account number and bill.  Will removing the digital phone service affect the pricing of my internet service? I do intend to *keep* my AT&T internet service.

Thanks again for the help.  Very much appreciated!

1 No, it just changes ownership of the number from one carrier to another, you still have to cancel your account. Just be careful since you want to maintain their Internet. 

2 This is a user forum, not AT&T support so you'd need to contact customer service for that answer. 

Thank you very much!

No, it just changes ownership of the number from one carrier to another, you still have to cancel your account.

@spoom2 That is not how it works on wireless. Porting a number cancels that line on wireless. Are you saying home phone does it different?

@sandblaster I have only once personally ported a number and that's the way it worked, it was a traditional landline to a wireless home phone.  I have helped or been involved with quite a few ports from landline to cable or cable back to landline and in each case the old line (not the number) was still active and the customer had to cancel it, as did I when I personally ported. I've never ported wireless to wireless and I've never ported a service from AT&T to another service so I can't speak to either of those.  I'd guess my experience was with at least six different carriers.