Why is the Mobile Number field removed from both Vendors and Customers??

This isn’t the experience we want you to have with managing the contact details of your customers and suppliers QuickBooks Online (QBO), tlheah.

QBO has updated the customer and supplier name and contact fields where you can enter the mobile number in the Phone number field or in the Other field for the company's person in charge's contact.

We see consumer feedback as an opportunity to improve the numerous features of our products. I'd recommend giving our engineers direct feedback. They may look into this suggestion and incorporate it into future updates. Here's how:

1. Go to the Gear icon.
2. Hit Feedback.
3. Type in your recommendation in the Share your feedback field.
4. Click Next.
5. Follow the on-screen instructions to complete the process.

On the other hand, we can add the company tax registration number on your invoices. Just go to the Custom form styles panel to customise an invoice and add the company registration number. Let me guide you on how:

1. Go to the Gear icon on the top menu.
2. Choose Custom Form Styles.
3. Tap Edit on the invoice.
4. Tick Content.
5. Click the Header part on the sample invoice.
6. Hit the Trade registration number link and enter the company tax number in the CRN field.
7. Press Done.

For more details about customising invoices, estimates, and sales receipts in QuickBooks Online (QBO): Customise invoices, estimates, and sales receipts in QuickBooks Online. I have articles here about customising sales forms:

• Add, customise, or remove logos on sales forms
• Customise sales forms by location

If there's anything else that I can help you with aside from entering the company registration number and contact details of your clients, please let me know in the comments below. I'll be here ready to lend a helping hand. Have a good one.

This is exactly the kind of response that says your management is being filled with people who don't understand how business works (you are an accounting system company!!), and your company is starting to decline and going the way of Blackberry and Nokia.
Unfortunately all those who had counted on and trusted your company (like us) will suffer. Your most loyal customers will suffer the most. We have trusted QBO as the heart and bedrock of our business since starting.

But luckily I see someone in charge has more sense and the Mobile number is back.

Next please add back the Business Registration Number under Account and Settings.
SST is there, but the BRN which is much more important info is not. Every single company worldwide has its BRN.

Advice - don't try to be smart, focus on doing simple basic things properly.
(eg kudos for doing the dark mode)

Simple things which you can improve:

Dark mode for your community and developer portal.