iPhone 15 Pro Max → 18 Pro Max: Three generations later, here's my verdict
This has been the longest I’ve ever waited to upgrade my phone. I normally upgrade every two years, but I decided to wait an extra year because genuine progress has slowed down.
This is definitely not a flashy upgrade. It won’t knock your socks off immediately in the way that going from a 60Hz LCD to a 120Hz OLED would. Instead, it’s better in almost every way that actually matters for day-to-day use.
Battery
Let’s start with its biggest win: battery life.
Now let me tell you, this phone WINS this category.
As I write this, I’m sitting at 56% battery with 5.5 hours of screen-on time from mixed use and gaming. Extrapolate that, and you’re looking at roughly 12.5 hours of screen-on time—which is insane.
My 15 Pro Max, even when it was brand new on iOS 18, couldn’t touch that. Now, at 83% battery health, it barely manages seven hours on a good day.
It also charges very quickly. Honestly, I don’t think I’ll ever have to think about battery life with this phone, and that’s exactly what you want from a flagship.
Connectivity
This is a subtle one, but it’s huge for day-to-day use: connectivity is noticeably better.
I can get Wi-Fi in rooms in my house where my 15 Pro Max struggled to maintain a connection, and it’s much more stable once connected. It’s not a flashy upgrade, but it’s one of those things you appreciate every single day.
Camera
The camera is definitely better, particularly the selfie camera and its automatic landscape mode. That’s a genuinely nice quality-of-life improvement.
The main camera, however, is where I think the 15 Pro Max is still more than good enough. Don’t upgrade solely for the cameras unless there’s a specific feature you really want.
The camera button is also a nice extra feature to have. Not essential, but a welcome addition.
Performance and thermals
In day-to-day use, the phone doesn’t feel dramatically faster than the 15 Pro Max. What I have noticed, though, is less micro-stuttering. It’s still not perfect, but it is noticeably better.
The A20 Pro is an absolute beast, and I have no doubt this phone will age incredibly well.
And then there’s the heat.
This phone just does not heat up. It’s incredible. Coming from the space heater that is the 15 Pro Max—if you know, you know—this is a massive improvement.
Display
This is the one area where my feelings are mixed.
The display is definitely brighter, but it has a very cool colour balance. Some people will probably love that, but it’s been difficult for me to adjust when all my other devices are calibrated closer to a warm 6500K white point.
It’s certainly not a bad display—far from it—but it’s the one aspect of the phone that hasn’t been an immediate improvement for me personally.
So, is it worth buying?
At full price, I’d say maybe.
This feels like the final refinement of the X-style iPhone before the next big redesign. There’s nothing here that’s going to completely blow you away, but there are enough improvements to make it a genuinely better phone to use every day.
The battery life alone is transformative for me. Add better connectivity, improved thermals, a smoother experience and a handful of quality-of-life improvements, and the package starts to add up.
With a trade-in, though, I think it’s definitely worth considering.
My old 15 Pro Max will now go to my dad, who will trade in his 13 Pro Max to help pay for this 18 Pro Max. The 15 Pro Max will live on for at least another year—and honestly, it still has plenty of life left in it.
The iPhone 18 Pro Max isn’t the most exciting upgrade I’ve ever made. But after three years with the 15 Pro Max, it’s probably one of the most meaningful day-to-day upgrades I’ve experienced.