Can I access my account again?
You are sign in here . . . with your Apple ID & Password.
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.
What happens when you use the same Apple ID that you use to sign in here?
See -> If you can't connect or sign in to iCloud
If you can't connect or sign in to iCloud - Apple Support
Check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID
If you forgot your Apple ID email address or phone number - Apple Support
OR see -> Having trouble signing in?
https://iforgot.apple.com/password/verify/appleid
See this Apple article: If you forgot your Apple ID password
If you forgot your Apple ID password - Apple Support
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support
See also -> Contact Apple for help with Apple ID account security
Contact Apple for help with Apple ID account security - Apple Support
but my secure phone number is not registered, there is only 1 number and that number is closed.
What do you mean with -> that number is closed?
You need to have a trusted phone number.
Look for / visit a carrier, take a subscription, postpaid or prepaid card.
Checks whether the SIM card is suitable for your iPhone.
See this Apple article: How to unlock your iPhone for use with a different carrier
How to unlock your iPhone for use with a different carrier - Apple Support
- Apple can't unlock your iPhone for use with a different carrier. Only your carrier can unlock your iPhone.
Normally (in the EU) after 2 years the consumer has the right to ask the previous carrier unlock the iPhone.
Then -> Sign in to your Apple ID account page and edit / update your Apple ID details.
https://appleid.apple.com
-> edit your 'new' trusted phone number.
Without a SIM card you cannot make and receive calls and no SMS, no WhatsApp.
There is also no service.
If there is Wi-Fi, you can still surf the internet and send and receive mail.