How Fast is Apple's First-Ever 5G Modem? The Results Are Surprising

iPhone 16e reviews are now out, and Apple's custom-designed C1 modem has been put to the test. The results so far are quite surprising, as the C1's speeds are not as slow compared to Qualcomm modems as originally expected.

apple c1
While the C1 does not support ultra-fast mmWave 5G in the U.S., it appears to offer comparable 5G performance to Qualcomm's Snapdragon X71 modem found in the iPhone 16, iPhone 16 Plus, iPhone 16 Pro, and iPhone 16 Pro Max.

First, here is what some reviewers said.

The Verge's Allison Johnson did not notice much difference between the C1 and the X71:

Much of the 16E is familiar, but there is one entirely new component: Apple’s C1 modem. This is its debut appearance, and the road to Apple's first in-house modem was reportedly full of setbacks and delays. I've used it for the past week to make FaceTime calls, upload large video files in crowded places, and stream YouTube on the bus. I tested it alongside a regular iPhone 16 equipped with a Qualcomm-made modem — both on Verizon — and I didn't see any consistent difference in performance between the two.

Tom's Guide's John Velasco didn't seem to notice any major difference either:

And finally, you should know that the iPhone 16e is the first device in Apple's portfolio to feature the company's in-house C1 modem. It's a departure from the Qualcomm modem that Apple's relied on for years now, but it's difficult to say if it ultimately delivers faster 5G speeds. I ran speed tests on both the iPhone 16 and 16e at three different locations in New York City, with only one test showing faster speeds with the iPhone 16e.

What about actual numbers?

In his iPhone 16e review video, Andru Edwards said the device achieved a peak 5G download speed of 673 Mbps in his suburban New York yard, while connected to the AT&T network. In the same location, he said the iPhone 16 Pro Max achieved up to a 667 Mbps download speed, so the results seem to be roughly equal.


In the middle of New York City, Edwards said his iPhone 16e achieved a download speed of 127 Mbps on AT&T, whereas the iPhone 16 Pro Max clocked in at 75 Mbps on the same network. In that test, the iPhone 16 Pro Max did have a superior upload speed of around 50 Mbps, compared to around 30 Mbps for the iPhone 16e.

In another iPhone 16e review video, shared by Dave Lee of the YouTube channel Dave2D, a speed test shows the device getting around 30 Mbps to 40 Mbps faster 5G download speeds compared to an iPhone 16 Pro Max. Both devices were connected to the Bell network in Toronto, the most populous city in Canada.


And finally, more scientific testing was shared on YouTube by the Chinese channel Geekerwan.

The channel tested 5G performance on various smartphones with an artificial 5G network in a lab environment, and the iPhone 16e had comparable 5G speeds and reliability compared to the iPhone 16 and other devices.

Apple says the C1 modem is the most power-efficient iPhone modem ever. More specifically, Apple seems to have told reviewers that the modem is up to 25% more power efficient than Qualcomm modems in other iPhones, and that appears to be an accurate statement. Geekerwan's testing found the iPhone 16e had an average power draw of 0.67W, versus 0.88W for the iPhone 16, which is indeed around a 25% improvement in efficiency.

C1 Modem 5G Power Draw
All in all, these results are surprising compared to reported expectations, and they prove that the C1 modem works just fine in both the real world and lab.

Related Roundup: iPhone 16e
Buyer's Guide: iPhone 16e (Buy Now)

Popular Stories

iphone 16 display

iPhone 17's Scratch Resistant Anti-Reflective Display Coating Canceled

Monday April 28, 2025 12:48 pm PDT by
Apple may have canceled the super scratch resistant anti-reflective display coating that it planned to use for the iPhone 17 Pro models, according to a source with reliable information that spoke to MacRumors. Last spring, Weibo leaker Instant Digital suggested Apple was working on a new anti-reflective display layer that was more scratch resistant than the Ceramic Shield. We haven't heard...
apple watch ultra yellow

What's Next for the Apple Watch Ultra 3 and Apple Watch SE 3

Friday April 25, 2025 2:44 pm PDT by
This week marks the 10th anniversary of the Apple Watch, which launched on April 24, 2015. Yesterday, we recapped features rumored for the Apple Watch Series 11, but since 2015, the Apple Watch has also branched out into the Apple Watch Ultra and the Apple Watch SE, so we thought we'd take a look at what's next for those product lines, too. 2025 Apple Watch Ultra 3 Apple didn't update the...
iPhone 17 Air Pastel Feature

iPhone 17 Reaches Key Milestone Ahead of Mass Production

Monday April 28, 2025 8:44 am PDT by
Apple has completed Engineering Validation Testing (EVT) for at least one iPhone 17 model, according to a paywalled preview of an upcoming DigiTimes report. iPhone 17 Air mockup based on rumored design The EVT stage involves Apple testing iPhone 17 prototypes to ensure the hardware works as expected. There are still DVT (Design Validation Test) and PVT (Production Validation Test) stages to...
Beyond iPhone 13 Better Blue

20th Anniversary iPhone Likely to Be Made in China Due to 'Extraordinarily Complex' Design

Monday April 28, 2025 4:29 am PDT by
Apple will likely manufacture its 20th anniversary iPhone models in China, despite broader efforts to shift production to India, according to Bloomberg's Mark Gurman. In 2027, Apple is planning a "major shake-up" for the iPhone lineup to mark two decades since the original model launched. Gurman's previous reporting indicates the company will introduce a foldable iPhone alongside a "bold"...
iPhone 17 Air Pastel Feature

iPhone 17 Air Launching Later This Year With These 16 New Features

Thursday April 24, 2025 8:24 am PDT by
While the so-called "iPhone 17 Air" is not expected to launch until September, there are already plenty of rumors about the ultra-thin device. Overall, the iPhone 17 Air sounds like a mixed bag. While the device is expected to have an impressively thin and light design, rumors indicate it will have some compromises compared to iPhone 17 Pro models, including only a single rear camera, a...
iPhone 17 Pro Blue Feature Tighter Crop

iPhone 17 Pro Launching Later This Year With These 13 New Features

Wednesday April 23, 2025 8:31 am PDT by
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of April 2025: Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone 16 Pro models have a titanium frame, and the iPhone ...
iPhone 17 Pro on Desk Feature

All iPhone 17 Models Again Rumored to Feature 12GB of RAM

Tuesday April 29, 2025 3:36 am PDT by
All upcoming iPhone 17 models will come equipped with 12GB of RAM to support Apple Intelligence, according to the Weibo-based leaker Digital Chat Station. The claim from the Chinese leaker, who has sources within Apple's supply chain, comes a few days after industry analyst Ming-Chi Kuo said that the iPhone 17 Air, iPhone 17 Pro, and iPhone 17 Pro Max will all be equipped with 12GB of RAM. ...

Top Rated Comments

turbineseaplane Avatar
9 weeks ago
Great!

If this is the future of iPhone modems, I want them to be as fantastic as possible!
Score: 42 Votes (Like | Disagree)
neuropsychguy Avatar
9 weeks ago
"Geekerwan's testing found the iPhone 16e had an average power draw of 0.67W, versus 0.88W for the iPhone 16, which is indeed around a 25% improvement in efficiency."

That's impressive. Does the same with less. Let's see how it holds up longer-term, but this looks like Apple's engineers were able to pull off designing a good modem.
Score: 42 Votes (Like | Disagree)
ignatius345 Avatar
9 weeks ago
This is good news, especially given how well the Apple Silicon processors have gone. Speed is always good, but for me it's much less important than the ability to acquire and reliably hold a signal.
Score: 38 Votes (Like | Disagree)
DaveN Avatar
9 weeks ago
That is a huge relief.
Score: 35 Votes (Like | Disagree)
california_kid Avatar
9 weeks ago
Ok, now I have to replace my 16 Pro.....
Score: 27 Votes (Like | Disagree)
JPack Avatar
9 weeks ago
Many other reviews are showing poor numbers, especially in China where mid-band 5G is very high speed.

C1 unable to reach 1 Gbps compared to X71.







SNR and signal consistently worse than X71.



Attachment Image
Score: 24 Votes (Like | Disagree)