I can’t get into my iCloud cause I don’t have the same phone number

The Apple ID say example1@icloud.com exists on server and you know the password and its account credentials , however that is signed in the device iPhone / Mac / iPad .

If you remember the trusted number and yet it is verified in the account , visit your cellular service centre with personal identification proofs .

If the account is set with two factor authentication from iPhone .

Issue a sim on behalf of the same number and insert the sim Set up cellular service on iPhone - Apple Support

In a new iPhone that is purchased Turn on and set up iPhone - Apple Support

The Apple ID and password is active so is the 2FA active on the iCloud server , once a new trusted number is added the code will start appearing on the new trusted number , and the person can access the account .

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

Then access the account and remove an old inactive verified number from the account .

Go to your Apple ID account page and enter your Apple ID and password.

In the Security section, click Edit.

Click Add a Trusted Phone Number. 

To add a number, enter the phone number and verify it with a text. 

To remove a number, click cross sign next to the phone number you want to remove. 

Note : you don't need account recovery from the server as Apple ID and password are known to you How to use account recovery when you can’t reset your Apple ID password - Apple Support

marzy112 Said:

"I can’t get into my iCloud cause I don’t have the same phone number"

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Contact Apple Support:

To get back in, contact Apple Support, and see if they can modify the number to what it should be over-the-phone.

Apple’s Contact Information:

• Contact Us - Choose Locations
• U.S.A:(800)MY-APPLE
• Proceed from there as necessary

Note: Phone calls are taking a bit to go through at the moment, due to lots of calls. And that makes sense, because with the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through