When you set up a new or used iPhone, after you turn it on, you see the Hello screen. Next, it prompts you for your language and location, along with your WiFi network. Eventually, it will prompt you to enter your Apple ID and password. To see exactly what this looks like, watch this YouTube video beginning at the 3:20 mark. Before that, he just discusses the iPhone features.
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Use these instructions from the Apple support page to locate your Apple ID.
https://support.apple.com/en-us/HT201354
If you forgot your Apple ID password, you can reset it.
https://support.apple.com/en-us/HT201487
I'm working out of state at the moment, and most of the year the temperatures probably fall within that range. But yes, in Texas, forget about it! April to December is steamy!
I had some brat at the Apple store help me set it up. yeah, maybe I did have to enter in my email/AppleID - I don't really remember. But I don't need anything to log on. My phone is just open, which is fine, as there is nothing on it.
How do I navigate to find my AppleID? I clicked on System Preferences, and poked around, but didn't see anything from there?!
Use these instructions from the Apple support page to locate your Apple ID.
https://support.apple.com/en-us/HT201354
If you forgot your Apple ID password, you can reset it.
https://support.apple.com/en-us/HT201487