No, your Galaxy S21+ case won't fit the iPhone 16 Pro Max
The Galaxy S21+ (161.5×75.6mm) and iPhone 16 Pro Max (163×77.6mm) differ too much for cases to be compatible.
Does a Galaxy S21+ Case Fit iPhone 16 Pro Max?
Last verified: March 2026
No, a Galaxy S21+ case will not fit the iPhone 16 Pro Max. The phones have different dimensions that make cases incompatible.
Your Galaxy S21+ case will NOT fit the iPhone 16 Pro Max. Here's why:
- •Camera module layout is different — cutout won't align
| Spec | Galaxy S21+ | iPhone 16 Pro Max | Diff |
|---|---|---|---|
| Height | 161.5mm | 163mm | iPhone 16 Pro Max +1.5mm |
| Width | 75.6mm | 77.6mm | iPhone 16 Pro Max +2.0mm |
| Thickness | 7.8mm | 8.25mm | iPhone 16 Pro Max +0.5mm |
| Camera Layout | vertical-triple | square-triple | Different |
| Port | usb-c | usb-c | Same |
Button & Port Alignment
- •New phone has Camera Control button — old case has no cutout for it
Since your Galaxy S21+ case won't work with the iPhone 16 Pro Max, here are the highest-rated cases that will:
OtterBox
OtterBox Defender for iPhone 16 Pro Max
$64.95
Spigen
Spigen Ultra Hybrid for iPhone 16 Pro Max
$16.99
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Size Comparison
Wireless Charging & MagSafe
Wireless chargers work with both phones, but magnetic snap varies.
- Your MagSafe charger will charge the Galaxy S21+ via Qi, but it won't magnetically snap on.
- Only the iPhone 16 Pro Max has built-in magnets for MagSafe accessories. The Galaxy S21+ needs a magnetic case or ring adapter.
Galaxy S21+
Qi only
15W max
iPhone 16 Pro Max
MagSafe Gen 2
25W max
MagSafe cases are NOT cross-compatible between these devices — the case body is shaped to each phone, even though the internal magnet ring may be the same.
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Frequently Asked Questions
Are Galaxy S21+ and iPhone 16 Pro Max the same size?
Galaxy S21+ measures 161.5×75.6×7.8mm while iPhone 16 Pro Max measures 163×77.6×8.25mm. They are different sizes.
Can I use a Galaxy S21+ screen protector on iPhone 16 Pro Max?
Screen sizes differ (6.7" vs 6.9") — protector won't fit.
What's different between Galaxy S21+ and iPhone 16 Pro Max dimensions?
The height differs by 1.5mm, the width by 2.0mm, and thickness by 0.5mm. The camera module layout is also different.
Do I need a new case for iPhone 16 Pro Max?
Yes, you'll need a new case. The iPhone 16 Pro Max has different dimensions than the Galaxy S21+, so cases are not interchangeable.
Will Galaxy S21+ accessories work with iPhone 16 Pro Max?
Chargers and cables are compatible since both phones use the same usb-c port. Both support wireless charging, so wireless chargers work with either phone. Cases and screen protectors depend on exact dimensions — check our compatibility results above.
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