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C1 modem planned for the iPhone 17 Air slower on some carriers

Summary by 9to5Mac
Apple has been working for many years on developing its own mobile data modem to replace the Qualcomm ones on which it has traditionally relied. The first of these, the C1 chip, was used in the iPhone 16e, and is also expected to be used in the upcoming iPhone 17 Air. There have so far been mixed messages on how well it compares to Qualcomm’s current chip, and a new study by Ookla provides our most detailed comparison yet … more…

10 Articles

As Apple pursues its ambition to design its own components, the C1 modem integrated with the iPhone 17 Air raises questions. Intended to replace Qualcomm chips, this home modem displays contrasting results across mobile networks. Indeed, a series of tests conducted by Ookla reveal significant performance differences. In particular, in the United States, where some operators seem to be better exploiting the capabilities of the C1 than others. Mix…

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Prior to the release of the iPhone 17 Air, Ookla published a study on the 5G performance of the C1 chip, which should be used by this new model.

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MacRumors broke the news in United States on Monday, September 8, 2025.
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