Best answer: Unfortunately, you can't use a OnePlus 6 case on the OnePlus 6T. The new phone is slightly taller than the outgoing model, and it's not close enough to let even flexible or loose cases fit on the new phone. You'll have to buy a new case to match.
OnePlus: Official cases ($19.95+)
The OnePlus 6T isn't dramatically larger than the 6, but it's enough
The OnePlus 6T moves to a larger screen, a full 6.41 inches, and that necessitates a larger casing. It's about 2 millimeters taller, but because of the also taller 19.5:9 aspect ratio the phone is actually narrower than the OnePlus 6. With a larger battery in tow, it's a bit thicker as well.
| Category | OnePlus 6T | OnePlus 6 |
|---|---|---|
| Dimension | 157.5 x 74.8 x 8.2 mm | 155.7 x 75.4 x 7.75 mm |
This all adds up to the reality that a OnePlus 6 case just won't fit on a 6T, no matter how loose or stretchy it may be. Aside from the general issue of the OnePlus 6 case having a hole in the back for a fingerprint sensor that isn't there on the 6T, the corners are just too far stretched to make even a flexible silicone case fit — believe us, we tried.
If history is any indication, there will be a robust market of third-party cases for the OnePlus 6T — we'll just have to wait for them to be released. Obviously OnePlus itself has a solid set of cases available from Day 1, running the range between a thin and grippy "sandstone" up to a thicker and rugged "nylon" case. Take your pick.
Time to buy a new case for your new phone
The OnePlus 6T is slightly taller and thicker than a OnePlus 6, so you'll need to buy a new case for the new phone. Thankfully, OnePlus makes great cases for its own phones, and they're available right away at reasonable prices.
