Carrier (ATT) Adding line at Apple Store

Are you porting in that line from another carrier or just starting with a new one? If not, and you're particular about the number...you can't pick your own number at the apple store. At att, you may select the area code and xxx-xxxx.

 

Unless you are looking to use Apple's iPhone Upgrade Program I would recommend using the Carrier's store. Most times there are specials you can use at the Carrier. You can also try others like Best Buy who have some periodic great specials.
The only real advantage for the Apple store is their new plan.

 

congrats, and good to know.