I haven't turned on my phone, called rep, she said I had to activate the phone first then go to the store with both phones and so the SIM swap. 
I tried to argue, but she insisted and added that it had to be done in person for "security reasons"
I don't believe her, and will try calling again when I can get away from work.
EDIT: finally got through again after almost 30 minutes on hold. Got someone who knew what she was doing! It still took a long time, and the rep was very apologetic, but I got the 5 working on a different line without disrupting the line that I upgraded with. She did say that I was the first swap upgrade that she'd done that actually worked without having to get a new SIM. I suspect because I didn't turn the phone on first, thanks to the great advice given here!!
	
		
			
		
		
	
				
			I tried to argue, but she insisted and added that it had to be done in person for "security reasons"
I don't believe her, and will try calling again when I can get away from work.
EDIT: finally got through again after almost 30 minutes on hold. Got someone who knew what she was doing! It still took a long time, and the rep was very apologetic, but I got the 5 working on a different line without disrupting the line that I upgraded with. She did say that I was the first swap upgrade that she'd done that actually worked without having to get a new SIM. I suspect because I didn't turn the phone on first, thanks to the great advice given here!!
			
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