said 10 months ago:
It would of course be the not-so-obvious way to sail around restrictions, but I think it would still be against the rules.
FB says that the cover picture may not contain contact information, such as web address, email, mailing address or other information intended for your Page’s About section. So even if you would wrap a phone number in the QR code (for direct dial or sms), it’s still information that you could put in the ‘about us’ section.
FB does not specify in which way you should not show this information. So any method to provide such info would be a breach.
You can of course take the risk, because maybe at this stage their checks are not as specific yet to include QR codes. But I personally think it’s just a question of time until they find a way to scan all codes efficiently.
Good luck if you try @moinshaikh