Why is my iPad 3 not supported

The 3rd generation ipad was discontinued almost 11 years ago. It can’t run anything later than iPadOS 9.

The iPad Mini 3 was discontinued in 2015. It tops out at iPadOS 12.

The 3rd generation iPad Air was discontinued in 2020. It can run the current version of iPadOS 16

Sorry, but "not supported" for what?

This is not Apple support; we are all other users here and have no access to accounts or anything else; you need to explain your problem.

What, exactly, do you mean? What are you seeing that makes you think it's "not supported".

If you're trying to pair it via Bluetooth, that's right. You can't do that. You've never been able to do that. It's not necessary.

Because your iphone is running a new iOS and your iPad is too old for that.

Electronic devices, like everything else, have a "shelf" life after which their hardware is too old to be updated.

Charrik wrote:

I’m sorry why isn’t my iPad Air 3 supported on my iPhone 14

An iPad Air3 is fully capable of update to the most recent version of iPadOS - at time of writing, this being iPadOS 16.5. You can only update to the most recent version of iPadOS supported by your iPad. All updates are cumulative; you cannot install and intermediate version.

If your iPad is capable of update to a more recent version of iOS/iPadOS than is currently installed, these support pages outline both the available methods by which the update can be performed - and troubleshooting should you experience difficulties:

Update your iPhone, iPad or iPod touch – Apple Support

If you can't update or restore your iPhone, iPad or iPod touch – Apple Support

If your iPhone, iPad or iPod touch won’t update - Apple Support

iOS update and restore errors – Apple Support

Be aware that while an iPad may be capable of update, in some circumstances (such as being too far behind the current release) you may need to use a computer to perform the update. To do so, you will need access to either a Windows PC (with iTunes for Windows installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of macOS). Ensure that your installed version of iTunes has been updated to the most recent version; the essential device drivers are included.

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

Update software on iPhone, iPad or iPod touch in iTunes on PC - Apple Support

If you have a beta profile installed, ensure this has been removed from your iPad - as, otherwise, installation of production software updates may be inhibited. This support page provides the necessary information to remove the beta from your iPad:

How to uninstall iOS beta software - Apple Support

You should note that for your iPad to install an available update, its battery must be charged to at least 50% capacity - and/or be connected to its Power Adapter. Similarly, the iPad can only be updated over a standard WiFi connection - or be updated by a PC or Mac using iTunes or Finder - over a USB connection.

A 2019 iPad Air 3 supports the latest iPadOS 16.5 AND will support the up and coming iPadOS 17.

So, what is the issue/s going on with your iPad and iPhone, exactly.