Thank you for getting back here in the Community, @kkirchner841.

I appreciate you providing more details about your concern. Currently, the option to customize statements in QuickBooks Online is unavailable. Also, the phone number will depend on the default format that was saved in the company settings.  

However, if in case you want to change your phone number, you can follow the steps provided by my colleague above. 

If in case you want to modify or change your sales forms in QBO, you may visit this article: Customize form styles. It includes visual and textual instructions about the process. 

Please know that you can always post here if you have any other questions. I'm always here to help. Take care always.