Essentially, I've been told I can only sign up for the iUP program in-store, but the iPhone Plus 128GB Black is currently listed as shipping in 3-4 weeks.
So, I'm wondering if I can go in store and still buy it, despite there not being any in-stock.
You certainly can go in as a walk-in customer. If they have it available in stock, you certainly should be able to buy one without being an iUP customer.
It was my first time doing IUP and I haven't gone into the store yet... ordered online, signed up for IUP, got my 7+ on Saturday (picked it up this morning from the UPS Store).
There's no reason you can't sign up for IUP online and wait for it to be shipped to you
Unfortunately, Citizens One has had inexplicable trouble signing me up for the program because they couldn't verify my information. They're finally acknowledging their mistake, but they say the only way for me to sign up right now is to buy an iPhone in-store. Otherwise I have to wait 30 days to be able to apply online again.