I'm upgrading an on-contract AT&T iPhone 5s this Friday, so I'll pay an ETF as part of the process. I'm selling it to Gazelle, which will more than offset that cost, but I need to unlock it first. I have a link to the AT&T unlock request form, but had a few questions: (i) Do I need to wait 14 days before putting in the request (the AT&T rep wasn't clear on that)? (ii) Can the phone still be unlocked even after I've switched my line to the new phone? I assume that whatever signal that needs to be sent to the phone can still be sent, but I'm unclear about the process. (iii) I expect a lot of requests to come in after the 19th, but generally how long does the process take? Anything else I should be on the lookout for? Many thanks in advance!