hi @accounting157 ,
Are you using QBO Global version or US version? You may check its address on your browser.
Hi there, accounting157.
You can only add a US-based mobile phone number if you're using the US version of QuickBooks Online. If you're located in China, you can sign up for QBO International. This will let you enter local addresses and contact information.
Let me know if you have follow-up questions.
Hi again, accounting157.
Thanks for confirming the version of QuickBooks that you're using. In this case, you can only enter a US-based contact information.
You can only visit our security to learn more how we keep your account secure. Here's the link: https://security.intuit.com/.
Don't hesitate to visit us anytime you have questions with QuickBooks.