Case-Mate Samsung Galaxy S23 Ultra Case [3in1] with FlexiShield Screen Protector & Camera Lens Protector [6.8"] [12FT Drop Protection] [Wireless Charging] Tough Black Phone Case -Rugged, Anti-Scratch

Q: How thick is the case? Is it less than 4mm?

Hello, The dimensions to this case are 6.65"L x 3.29" W x 0.50"D. I hope this helps.

Q: Does it allow auto off when you close the flap

Nice solid case. I never had a problem with it interfering with any of the phones functions.

Q: Says it has anti yellowing materials but is that just for the hard plastic back or are the softer edges anti yellowing as well?

So far, there hasn't been any yellowing on any part of the case. I know with most clear cases, including the Otterbox Symetry, the case yellows on the sides of the phone easily, so I was worried this case would too. I've had this case on since June and it still looks brand new, even with it being constantly in and out of my pocket for work.