Does it work with a case?

Only with MagSafe-compatible cases (those with the magnetic ring). Standard thick cases weaken the magnetic hold.

Can it charge older iPhones?

Yes, it works as a standard Qi charger for iPhone 8 and later, but without the magnetic alignment or full 15W speed.

Do not place credit cards between the iPhone and the MagSafe charger; the magnets can damage magnetic strips.

Introduced with the iPhone 12, MagSafe uses magnets to perfectly align the wireless charger for faster speeds.

Power Check: Ensure your MagSafe charger is connected to a 20W (or higher) USB-C power adapter. If the adapter is under 20W, charging will be slower.
Clear the Back: Remove any non-MagSafe cases, credit card holders, or metal attachments from the back of your iPhone.
Snap it On: Place the MagSafe charger on the back of the iPhone. The magnets will snap it into the perfect center.
Confirmation: Look for the circular charging animation on the screen, which indicates a successful MagSafe handshake.

Does it work with a case? Only with MagSafe-compatible cases (those with the magnetic ring). Standard thick cases weaken the magnetic hold.
Can it charge older iPhones? Yes, it works as a standard Qi charger for iPhone 8 and later, but without the magnetic alignment or full 15W speed.
Is it safe for credit cards? Do not place credit cards between the iPhone and the MagSafe charger; the magnets can damage magnetic strips.