Two-factor authentication: This will be hard for me (new phone) - esp AppleID

NOT SOLVED. Thanks for reply, muguy, but I have more questions now. More on same basic issue; plus, I'm new to this board, which might be why I don't understand something else.

You misunderstood my original post. I really want to keep the one AppleID that I'm now using. The problems are:

A. how do I live with that? I can't count on having a 2nd piece of hardware to satisfy 2-factor authentication. "Trusted device" won't go with me to the store. "Trusted phone #" may disappear in the process of getting new iPhone working.

B. I may have to get a new AppleID b/c the dealer won't want to bother with my existing one.

C. Your reply showed up in my email in-box, but it didn't show up on:

remember-mac-plus’s Profile - Apple Community

which is

discussions.apple.com/profile/remember-mac-plus/participation

(I've stripped out the https - colon slash slash so I can see the link!)

-- Maybe my question stays invisible to others until some moderator ok's my question for others to see. Do I need to go to some forum that isn't part of Apple? If so, can you suggest some?

remember-mac-plus (I'm an old guy!)

My issues are complex, but I think the hard parts are solved.

I previously wrote: ... I can't count on having a 2nd piece of hardware to satisfy 2-factor authentication....

muguy>> Otherwise, your current iPhone, or phone number, will be sufficient.

This point solved, but not by muguy's answer. First, there isn't a current iPhone -- it doesn't exist yet -- I plan to buy it tomorrow. Second, I'm learning how to get my mobile phone number to work. I tried phoning a local Apple store. They referred me to some 800 number - not a "genius", but some other kind of support line. There, I could talk w someone in Apple who could understand my issues enough that by working together, I now have a plan. The plan is:

1. Prepare everything I can before I buy the new phone.

2. I was planning to buy iPhone at Boost Mobile store -- Boost Mobile is my cell service provider, & I like 'em, & it would save me $150. But the store ran out of iPhones & I don't want to wait until their supply is restocked.

3. I will go to Apple store. Buy iPhone, but DON'T do a critical step to make it work. Apple can't do the "SIM card" step in my situation. ("SIM cards" are sometimes physical cards, sometimes virtual.) Instead, I will take brand new iPhone to Boost Mobile store. Normally, the cell service provider is the outfit who would update or replace an existing "SIM card." My case is harder: My cell phone is so old, it doesn't have a "SIM Card." Today, I hand-copied a lot of codes out of my old cell phone. The Boost Mobile store should be able to get me a "SIM card" that works with new iPhone. When that's ok, my old cell phone is dead, but I think iPhone will work. Also, I get to keep the same phone number.

I spent a long time on hold before I got to this Apple person, but it was worth it.

4. Learn the iPhone enough to recharge it, wake it up, answer & make phone calls, put it to sleep. (I won't turn it off every night, but I was surprised to learn this.) Then learn more -- I bought a book "My iPhone for Seniors" -- it answers lots of my questions.

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I previously wrote: Maybe my question stays invisible to others until some moderator ok's my question for others to see. Do I need to go to some forum that isn't part of Apple? ...

muguy>> Your question is active immediately in the forum

This point solved, I think. I couldn't see it when I first logged into this website, but I can now. I don't yet know why -- I'm still learning how to find my way around.

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So thank you, muguy.

I clicked something & my monitor says my issue is "solved." I have replied, but that doesn't mean it was solved.