Good afternoon, 20jrg20.
 
Thanks for reaching out to us here. QuickBooks Online provides the option to change your phone number when you need to. I would be happy to help you get back on track!
 
To change your phone number, follow these steps below:
 
1. Sign in to QuickBooks Online.
2. Select your profile icon next to the Gear icon.
3. Select "Manage your Intuit Account". This opens the Intuit Account Manager.
4. Select the "Sign in & security" menu.
5. Select the "User ID, Email address, Password, or Phone" section.
6. Make your changes.
7. When you're done, select "Save".
 
Here's a helpful guide for reference.
You will also need to change your phone number in your Company settings. You can do this in just a few simple steps.
 
1. Head to the "Gear icon"
2. Select "Account and Settings"
3. Click on Company, and change the phone number in this section.
4. Hit save
 
Don't hesitate to reach back out if you have any other questions.