Transfer from one iPhone to another
I’ve read Transfer content from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support, but it’s not clear when I should put the SIM in the new iPhone.
I’d rather do it after transferring because I have to reinstall on the old iPhone to finish the unlocking and I need to do that before transferring my phone number to T-mobile. I realize that putting in the SIM won’t make that happen, but to be sure I’d rather wait. Will the app and data transfer proceed without complications without the SIM?
iPhone 6s, iOS 11.3.1