Is this iPhone 18 Pro wallet case compatible with other old iPhone Pro series such as iPhone 17 Pro?

No, it is compatible with iPhone 18 Pro ONLY, so they don't fit for the iPhone 11 Pro/12 Pro/13 Pro/14 Pro/15 Pro/16 Pro/17 Pro as they have different sizes and designs. Please check your phone model before ordering.

Is it thick? Does this iPhone 18 Pro wallet case influence wireless charging?

Yes, because the card holder on the back is a little bit thick and tight for sore more cards, which will influence the wireless charging. So please make sure to remove the case from the phone if you want to charge wirelessly.

How many cards does the iPhone 18 Pro case with card holder store?

Our iPhone 18 Pro case wallet with RFID Protection can store 4-5 pcs cards and a few sheets of cash. It depends on the thickness of the cards and the money.

How to keep it as durable as its original color as long as you can?

To avoid the bright color peeling off after repeated use, please do not use the wet wipe to clear this iPhone 18 Pro case and keep away from the scraped by the rough or sharp stuff frequently.

Does this dual slide camera cover stays closed well? Can put the extra separate camera protector on?

Yes. We have reinforced the slide cover for durability and it doesn't need the extra camera protector as it will keep your lens protected! Open main slider to shoot, close for privacy; mini slider gives instant flashlight/LiDAR and dust seal.