I'm having trouble logging into my iPhone

Perhaps the article which appears above your inquiry, has a few

potential pathways to try & use, to resolve issues faced now?

If your Apple ID is locked or disabled - Apple Support

//support.apple.com/en-us/HT204106

This article seems to include three(?) possible things, to try..

And these section looks to include your inquiry, if no other:

•If your account has been disabled for security reasons

"..If you see one of the following messages, your AppleID automatically

locked to protect your security & you can't sign in to any Apple services:

• “This Apple ID has been disabled for security reasons”
• "You can't sign in because your account was disabled for security reasons"
• "This Apple ID has been locked for security reasons"

.."You need to reset your password to regain access. 

Learn how to reset your password."

If you forgot your Apple ID password - Apple Support

//support.apple.com/en-us/HT201487

[PS: after comparing article content to post

seeing now similar items listed in above!]

Please check ⤵️

1.

If you see a message that says "Your account has been disabled in the App Store and iTunes", there is a problem with your payment method on your account, to resolve the problem you need help from Apple support,  click -> contact Apple Support for help.

2.

If your Apple ID is locked or disabled -> If your Apple ID is locked or disabled - Apple Support (CA)

-> Get a verification code and sign in with two-factor authentication

Get a verification code and sign in with two-factor authentication - Apple Support

3.

See -> Add a payment method to your Apple ID

Add a payment method to your Apple ID – Apple Support (UK)

• If you want to change your card, you need to add first the new card, then remove the old card.
• or if you use your Apple Account balance, you need to set your Apple Account balance as your default payment.

See also -> Payment methods you can use with your Apple ID

Payment methods you can use with your Apple ID – Apple Support (UK)

fyi: Not all credit & debit cards seem to work with App Store / iTunes Store, try a different one, or preferably a credit card. If your card is not accepted as a paymenf method, you need to contact your bank.

If you have followed all the steps and instructions and if you still need help, get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.