Require to Change register mobile number asap. Because we are unable to change any company settings because of that registered number disconnected. Please call ASAP.

Hi there, kavya.

Thank you for reaching out to us here on the QuickBooks Community page.

I can see how urgent you need to change the registered mobile number and to call you as soon as possible. Currently, we're unable to call you directly. However, I'd recommend going to the Help icon. From there, you can contact us through messaging so that our QuickBooks Support Team can discuss the concerns with you. Please note that we also have limited staff and reduced support hours due to the pandemic. They're only open from 9:30 AM to 6:00 PM Monday-Friday.

Here's how to contact them:

1. Log in to your QuickBooks Online (QBO) account.
2. Go to the Help menu.
3. Type your question in the search box below or click on one of the following frequently viewed topics.
4. Click No, I still need help.
5. Select Contact QuickBooks Support.
6. You'll be routed in the Choose a way to connect with us page.
7. Choose Chat.

Please check this article on how you can update your business info in QuickBooks Online: Change your business name, contact info, or PAN in QuickBooks Online.

I'm also adding different articles to further guide you in effectively managing your business using QBO: Help guide for QuickBooks Online. It contains topics about advanced accounting, banking, and payments to name a few.

Please comment below if you need anything else. I'm always here to help.