Anyone upgrade another line but plan to switch number?

I plan on updating my dumb phone, transferring new 5 to my number then giving girlfriend my 4s and selling her iphone4 lol..

 

I did that to get my 4s on Verizon. I was so sick of my Fascinate.
I had way too long to wait for upgrade. I walked in to Best Buy, said I want to add a line with a 4s. This was right before the tiered Data plans took in effect.
So dont know how this works now.
But I gave them a dumb phone. After purchase, they switched the iPhone to my current number, put dumb phone on new line.
So I got a 4s for $199 and unlimited data, just paid $10/month for the dumb phone.

It was Verizons idea, so its not sneaky.
I see it being harder cause of new shared plans, but hey, try it.

 

I have a family line and am using one of the other lines for the iPhone upgrade.

I plan on contacting att to get my swap done as soon as I get the phone in my hands. I won't even turn it on until I get in contact with att. The swap becomes more complicated if the phone is activated.

 

I ordered mine using my wife's line, we have 4 lines in our family plan and I already used mine to upgrade my wife to a 3GS. I wll head straight to my AT&T store when it arrives since I am grandfathered in for the $30 "Unlimited/throttled" plan.