Need to change business name (using my iPhone) to a company name, ACN & new bank account details

I've got you covered on how to update your company information in QuickBooks Online (QBO). 

We can change the business name and other company information using your iPhone as long as we access your QBO account through the web. Once you signed in, follow the steps below to update the company name and ACN or ABN: 

1. Go to the Gear icon on the top menu and select Accounts and settings.
2. Choose Company, then Edit in the Company name section.
3. Enter the new name in the Company name field.
4. If the company's legal name is different from the Company name you entered, we can enter the legal name in the Legal name field.
5. Otherwise, tick the Same as company name box.
6. Enter or edit your ABN in the field provided.
7. Press Save, then select Done.

You can check out this article for more details: Change your company name, contact info, or ABN in QuickBooks Online. If you are trying to update your new bank details as a payment method, follow the steps in the Update or change your payment method section in this article: Manage billing, payment, and subscription info in QuickBooks Online.

In case you need to include bank details on your invoices, refer to this article: Adding bank details to your invoices.

Don't hesitate to reach us in the Community if you have further concerns about managing your company details or any QuickBooks related. We'll be here to assist you every step of the way. You have a good one.