Hey there mitchd53,
Let's see if this info helps out:Two-factor authentication for Apple ID. This should open to the "Manage your trusted phone numbers" section. Here's the items you'll want to check:
- Check and add a trusted phone number if needed
- View your trusted devices.
We're suggesting this to make sure you understand and know what devices you can use. We also wanted to call out this section:
"What if I can't access a trusted device or didn't receive a verification code?
If you're signing in and don’t have a trusted device handy that can display verification codes, you can have a code sent to your trusted phone number via text message or an automated phone call instead. Click Didn't Get a Code on the sign in screen and choose to send a code to your trusted phone number. You can also get a code directly from Settings on a trusted device. Learn how to get a verification code.
If you use iOS 11.3 or later on your iPhone, you might not need to enter a verification code. In some cases, your trusted phone number can be automatically verified in the background on your iPhone. It’s one less thing to do, and your account is still protected with two-factor authentication."
If you lost your iPhone, you can always use sign in to iCloud.com/find on a web browser or another trusted device as described in If your iPhone, iPad, or iPod touch is lost or stolen. This is why it's important to know which device you own is trusted.
We hope this helped out.
Take care.