At this time, we're unable to print checks in QuickBooks Online (QBO) Mobile app. You'll want to log in to your account through a web browser on your device and create a check from there. However, a check number is required to print the form.
Then print the check directly to your wireless printer. Just make to install an Adobe Reader on your mobile phone.
Click on the + New button and choose Check.
Enter all the information.
Click on Print check and select Preview and print.
Follow the onscreen instructions to print the check.