The case I bought for my 18 Pro keeps lifting slightly at the lower corner whenever I take it out of my pocket, and the loose fit is already getting annoying. I tried removing and reseating it, but the corner still pops up.
What case are you running on the 18 Pro, and does it fit securely without making the buttons stiff or adding too much bulk?
Don’t keep reseating a case that pops off at the same corner. That usually means the shell is slightly warped, the lip was molded poorly, or a screen protector is pushing against it. Take the protector out of the equation once if you can. If the corner still lifts, return the case.
For a slim replacement, I’d look at Apple’s Silicone or TechWoven case first. The price is harder to justify, but the fit and button alignment should be less of a gamble this early in the phone’s release. The silicone version will grip a pocket more, while TechWoven should slide in and out with less resistance.
Spigen’s thinner cases are another option if you want something less expensive, but check that the listing is specifically made for the current phone. Some early marketplace listings reuse old photos or packaging, and a tiny difference around the camera or button cutouts can cause exactly this kind of corner lift.
Whichever case you choose, press each corner with the phone installed before throwing away the packaging. A properly fitted case should snap back immediately and stay seated when you push sideways near the lower edge. Stiff buttons sometimes loosen with use, but a corner that already pops free rarely gets better.
A case that is a bit tight on your pocket will only become more annoying. The pocket friction is probably pulling the lower lip in, but a correctly sized case should keep it locked around the corner.
I’d stay away from another hard ultra-thin shell (the kind with no thickness) and go with a matte TPU case, with flexible corners and a continuous bottom edge. These types of cases absorb the tugging rather than popping off (I think). You don’t have to spend the amount of money Apple does either. Fit is more important than the logo and having a return policy handy is useful while accessories are still rolling in.
@0xloop7 is right about checking the screen protector, especially if it extends close to the edge. If the case lifts with the protector removed, I’d return it rather than trying tape or heating the shell into shape.
A rigid snap-on shell will pop loose much faster than a hybrid case with a grippy bumper and firmer back. I’d switch to the latter, preferably with individual speaker and charging-port cutouts so the bottom edge stays anchored. Before ordering, double-check that your current case isn’t for a neighboring model since tiny dimension differences often show up exactly like this.
Avoid wedging the corner in place with tape or anything else. It may stop the motion for a day, but will likely grind debris against the frame and scratch your phone.
Before blaming the screen protector, see if you have any sort of tab, magnets, skins wrapping around the corner, or even a thick sticker on the back of the phone that could cause the bottom rail of the case to push out sufficiently for a pocket seam to catch it. This is especially true for tether tabs that come through the charging opening. Test the case with the phone inside being completely bare.
For a replacement, I would look towards one piece cases that have only slightly raised edges, covered buttons and avoid having a giant open space across the bottom. A smooth back with some ridges along the rails on the sides is a better pocket solution than a fully rubbery case. You get some grip while holding it without having the whole thing dragging the pocket linings out with it.
I’m not convinced that the price of one ensures a perfect fit. Cases can be inconsistent from one production run to the next. If the bare phone still causes that corner to lift, exchange it so long as you can and don’t wait for it to “settle”. A loose lower corner tends to become a dusty lower corner after a while.
Put a wraparound TPU next to a snap-on hard shell and watch the bottom edge. The TPU flexes back over the frame and stays parked because the whole rail is under slight tension. The hard shell relies on four little tabs biting the corners, and once one tab loses its grip it never really reclaims it. That’s your problem right there, and no amount of reseating fixes a tab that’s already given up.
@neonworks9965lab has the right instinct with the hybrid bumper idea. I’d go further and say the material at the corner matters more than whether the back is rigid. A firm polycarbonate back with a soft edge is fine. A fully rigid corner on a phone this size is asking for exactly the lift you’re describing, because there’s no give when your pocket seam tugs it.
Where I’d slow down is the whole ‘wrong model’ theory. It happens, sure, but people jump to it too fast. Before you assume the case is for a neighboring size, check if it’s just a bad unit from the batch. Same listing, same model, and one shell out of the run comes out slightly off in the mold. Return it and reorder the identical case rather than switching brands, and half the time the replacement seats fine.
The bare-phone test that @bytecraft mentioned is the step I wouldn’t skip. Anything behind the phone changes the geometry at the bottom rail, and a MagSafe wallet or ring plate is the usual culprit nobody thinks about. Strip it down to the naked phone, install the case, then press near the charging port and try to peel the corner with a fingernail. If it holds bare and pops with your stuff behind it, the case is innocent.
One more thing worth knowing before you spend more. A slim case will always fight you a little on a heavy phone, because there’s less lip to hold and less material to absorb the yank. If pocket friction is the real enemy, going slightly thicker with a taller edge does more for you than chasing the perfect fit on another ultra-thin shell.
If it only happens with one pair of pants, it’s probably not that the pocket opening is catching a sharp case lip, but exposing a poor fit. Compare the lower corners (the one that’s squared and raised up a bit) to one that has a rounded edge and smoothly transitions into the side rail.
As for pocket use, I’d go with a smooth hybrid case over silicone or a bare snap-on shell. Too much silicone will tend to cause dragging, and rigid shells can unexpectedly release when caught by something. A flexible frame with smooth back face will give up some corner retention without making every pocket opening a tug of war.
On the other hand, test the current case outside the pocket. If applying light pressure laterally on the bottom makes the corner unhook, it’s defective or badly shaped and should be returned. If it’s firmly seated, try a case with a more rounded lower lip than a simple square one, rather than getting a thicker case.
Don’t keep forcing the lower corner down without checking any camera-lens protector first. A thick glass camera cover or individual lens rings can contact the edge of the camera opening and bow the case back slightly. The resulting tension often shows up at a lower corner, nowhere near the actual obstruction. That gets missed because people focus on the screen protector.
Set the empty case on a flat table as well. If it rocks or one corner sits higher, the shell is twisted. If it lies flat, install the completely bare phone and look closely around the camera opening for contact before testing the lower edge. Mold flashing inside the corner groove can cause the same issue, but I would return the case rather than cutting or sanding it.
For a replacement, I’d choose a smooth-backed case with a flexible perimeter and a camera opening that leaves visible clearance around the raised area. It doesn’t need to be bulky. The important detail is that the back isn’t being held under tension, because once that happens, pocket friction only reveals the problem faster.
Don’t miss the return window opportunity while you are waiting for that corner to settle. It probably won’t. I would buy the replacement locally and fit it before you leave the store. Batch differences are a lot more important than brand recommendations.