Apple Already Testing a C2 Modem for iPhones, According to Leaker

Apple is already testing its second-generation C2 modem for future iPhone models, according to a leaker with a proven track record.

iPhone Chips
A private account on X with a history of sharing accurate information said the C2 modem has a C4020 identifier within Apple, which seems to confirm that it already exists. However, the leaker did not provide any further details.

The leaker has requested that we not link to their private account in our coverage of their posts.

Apple has publicly confirmed that it starts developing new iPhone chips several years in advance of them launching, so it is not surprising that the company is allegedly working on a C2 modem. Apple's second-generation modem should offer faster and more reliable 5G connectivity, and it could be even more power efficient.

Apple said the C1 modem in the iPhone 16e is already the most power-efficient iPhone modem ever, contributing to the device having the longest battery life of any 6.1-inch iPhone ever, including the more expensive regular iPhone 16.

We are still waiting for C1 modem speed tests, but it is expected that Apple's first modem will be slower than Qualcomm's latest Snapdragon X71 modem in other iPhones.

In an interview, Apple's chipmaking chief Johny Srouji said the C1 modem is just the "start," so the C2 modem will be the next chapter of the story.

Popular Stories

iOS 26.1 Coming Soon: New Features for Your iPhone and Release Date

Monday October 27, 2025 7:55 am PDT by
The upcoming iOS 26.1 update includes a handful of new features and changes for iPhones, including a toggle for changing the appearance of the Liquid Glass design, "slide to stop" for alarms in the Clock app, and more. Below, we outline key details about iOS 26.1. Release Date Given that Apple has yet to seed an iOS 26.1 Release Candidate, which is typically the final beta version, the...

6 New Things Your iPhone Can Do in iOS 26.1

Wednesday October 29, 2025 4:22 am PDT by
Apple is about to drop iOS 26.1, the first major point release since iOS 26 was rolled out in September, and there are at least six notable changes and improvements to look forward to. We've rounded them up below. Apple has already provided developers and public beta testers with the release candidate version of iOS 26.1, which means Apple will likely roll out the update to all compatible...

Apple TV 4K Could Still Launch Before 2025 Ends: All the Rumored Features

Monday October 27, 2025 4:51 pm PDT by
Apple is designing an updated version of the Apple TV 4K, and rumors suggest that it could come out sometime in the next couple of months. We're not expecting a major overhaul with design changes, but even a simple chip upgrade will bring major improvements to Apple's set-top box. Subscribe to the MacRumors YouTube channel for more videos. We've rounded up all the latest Apple TV rumors. ...

M6 MacBook Pro: Release Date, Pricing, and What to Expect

Monday October 27, 2025 9:15 am PDT by
Apple this month refreshed the 14-inch MacBook Pro base model with its new M5 chip, and higher-end 14-inch and 16-inch MacBook Pro models with M5 Pro and M5 Max chips are expected to follow in early 2026. However, these machines will represent the final update to the current design, with Apple reportedly developing a completely new version of the MacBook Pro packed with next-generation hardware...

Apple Seeds iOS 26.1, iPadOS 26.1, and macOS Tahoe 26.1 Release Candidates

Tuesday October 28, 2025 1:07 pm PDT by
Apple today provided developers and public beta testers with the release candidate versions of upcoming iOS 26.1, iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, watchOS 26.1, and visionOS 26.1 updates for testing purposes. The RCs betas come a week after Apple released the fourth betas. The new betas can be downloaded from the Settings app on a compatible device by going to General > Software...

iOS 26.1 Beta Liquid Glass Battery Drain Test: Tinted vs Clear Mode

Friday October 24, 2025 2:30 pm PDT by
In the fourth iOS 26.1 beta, Apple added a "Tinted" option that reduces the translucency of Liquid Glass for those who prefer a more opaque look. I saw some comments wondering whether the setting might preserve battery life, so I thought I'd do some testing. Test Settings I did four separate tests using the iPhone 17 Pro Max, and I kept the parameters as similar as possible. Here are the...

Apple Says U.S. Passport Feature on iPhone is Coming Soon

Monday October 27, 2025 7:41 am PDT by
You will "soon" be able to add a digital version of your U.S. passport to your iPhone, according to Jennifer Bailey, vice president of Apple Pay and Apple Wallet. Bailey reiterated that the feature is coming soon during her keynote at the Money20/20 USA conference in Las Vegas on Sunday. On its iOS 26 page, Apple says the delayed feature will be "coming later this year." Apple's...

Here Are Apple's Release Notes for macOS Tahoe 26.1

Tuesday October 28, 2025 1:21 pm PDT by
Apple today provided developers and public beta testers with the release candidate version of macOS Tahoe 26.1, which means the update will likely see a public launch next week. The release candidate includes notes on what's in the update, so we have a full picture of the new features that Apple has included. macOS Tahoe 26.1 adds AutoMix support over AirPlay, improved FaceTime audio...

iPhone XX? 6 Features Rumored for Apple's 20th Anniversary iPhone

Monday October 27, 2025 4:01 pm PDT by
For the 10th anniversary iPhone that came out in 2017, Apple introduced the iPhone X with Face ID, notch, and minimized bezels, providing more display space than ever before. The 20th iPhone anniversary is approaching and Apple wants to take the iPhone X design even further. We're two years away from the 2027 iPhone, but it's tough for Apple to keep major changes under wraps. We've rounded...

Top Rated Comments

9 months ago
of course they are, the C1 probably entered mass production 6 months ago which means the design was done and the chip taped out a year or so ago. That's when the designers moved onto the next one ...
Score: 25 Votes (Like | Disagree)
9 months ago

I still don’t see how Apple could possibly match the performance of Qualcomm, Huawei or even MediaTek in the cellular chip world.
In previous decades, people would have said the same thing about Apple trying to make CPUs that were competitive against Intel and AMD.
Score: 15 Votes (Like | Disagree)
9 months ago

I recall Rene Richie quipping that Apple prototypes everything, and likely has an Apple refrigerator/toaster somewhere in a lab (not that they'll ever release it). If you have the resources, building one of something is a great way to find out more about whether such a device/chip/product is good/useful, and what benefits/drawbacks it has. So, yeah, they almost certainly have a C2 and a C3 in the works, along with all sorts of other future hardware.
I want an Apple toaster. They can use Intel chips. ?
Score: 12 Votes (Like | Disagree)
9 months ago

I still don’t see how Apple could possibly match the performance of Qualcomm, Huawei or even MediaTek in the cellular chip world. It’s an area mandate technology accumulation. The other three have already worked on it for two or more decades. It’s a path toward a sure failure from the very beginning.
The only certain way to fail would be to not start with the thing at all. Apple is playing catch up, maybe, but with an eye on the long haul.
Score: 9 Votes (Like | Disagree)
9 months ago
According to industry insiders, Apple is testing new iPhone 17 and new M5 processor for Mac. Rumors even reveal a potential iPhone 18
Score: 9 Votes (Like | Disagree)
9 months ago
It is a given... the iPhone 19 is likely prototyping by now. Same with the iMac 30" or 32"
Score: 7 Votes (Like | Disagree)