Using an iPhone 12 in Dual SIM mode throttles the cellular data speed to 4G LTE, according to an Apple Sales FAQ shared with retailers and carriers.
All 5G iPhone 12 models support Dual SIM mode, which refers to the ability to switch between a SIM card and an eSIM operating on independent numbers and/or carriers. However, an image of a training document from Apple's Sales Web resources called "What you need to know about 5G on iPhone" and posted to Reddit suggests the iPhone 12 will not support 5G on either line when Dual SIM mode is active. The FAQ reads:
"Does 5G work with Dual SIM?" When using two lines in Dual SIM mode, 5G data isn't supported on either line and will fall back to 4G LTE. If customers are using eSIM only and are on a 5G-supported carrier and service plan, they'll have 5G access.
The document suggests that only by disabling one SIM or the other will 5G speeds be available – a limitation that, if confirmed, will come as a blow to iPhone 12 customers who intended to use separate work and personal lines, for example.
On the bright side, this incompatibility could be a software issue, and therefore something Apple could resolve down the line. Indeed, the Reddit user who posted the above image claims that an update coming later in 2020 will enable 5G when using a Dual SIM mode.
This information is allegedly revealed in Apple's internal training documents, but 5G is not anywhere mentioned in Apple's Dual SIM support page, which was last updated on September 26. We've reached out to Apple to clarify the matter and will update this article if we get a response.
(Thanks, De Paul Sunny!)
Update: MacRumors has received independent confirmation that the documentation is genuine.
Friday September 19, 2025 10:02 am PDT by Joe Rossignol
As reported by Bloomberg today, some of the new iPhone 17 Pro and iPhone Air models on display at Apple Stores today are already scratched and scuffed.
French blog Consomac also reported on this topic.
The scratches appear to be most prominent on models with darker finishes, including the iPhone 17 Pro and Pro Max in Deep Blue, and the iPhone Air in Space Black.
Images Credit: Consoma ...
Monday September 22, 2025 12:44 pm PDT by Juli Clover
Apple released the first beta of iOS 26.1 today, just a week after launching iOS 26. iOS 26.1 mainly adds new languages to Apple Intelligence, but there are a few other features that are worth knowing about.
New Apple Intelligence Languages
Apple Intelligence is now available in Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese.
AirPo...
Monday September 22, 2025 2:16 am PDT by Tim Hardwick
Next year's rumored foldable iPhone will showcase an ultra-thin design resembling "two titanium iPhone Airs side-by-side," according to Bloomberg's Mark Gurman.
Writing in the Q&A section of his latest Power On newsletter, Gurman says Apple's first foldable device will be "super thin and a design achievement," combining Apple's thinnest iPhone form factor with cutting-edge folding...
Thursday September 18, 2025 9:17 am PDT by Joe Rossignol
Apple is preparing to release iOS 26.0.1, according to a private account on X with a proven track record of sharing information about future iOS versions.
The update will have a build number of 23A350, or similar, the account said.
It is likely that iOS 26.0.1 will fix a camera-related bug on the new iPhone Air and iPhone 17 Pro models. In his iPhone Air review, CNN Underscored's Henry T. ...
Monday September 22, 2025 8:44 am PDT by Joe Rossignol
Apple's latest iPhone models launched on Friday, and some early adopters of the devices are experiencing intermittent Wi-Fi issues.
Affected customers say Wi-Fi connectivity periodically cuts out on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air, with hundreds of comments about the issue posted across the MacRumors Forums, Reddit, and the Apple Support Community over the...
Monday September 22, 2025 11:15 am PDT by Juli Clover
With iOS 26.1, Apple Intelligence is gaining support for additional languages, including Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese.
Apple announced plans to expand the languages that can be used with Apple Intelligence last year, and now the added language support is here. Apple Intelligence is now available in the following...
That's pretty unacceptable if true, and if its unfixable is likely to be a deal breaker for a small but important minority of power users (myself included).
If this is anything more than just an initial software bug (AKA if this is a hardware limitation) I really have to question whether or not the iPhone 12 is ready for prime time.
Ok... show me show Sidney is blanketed in 5G... today
I assume you mean Sydney. Here is one of the 3 networks for this little village. Covers where i live, work, run, drink, gym, BJJ and where 99% of my friends live. Next?
Order is now cancelled, sticking with XS for another year. Disappointing because I was looking forward to some new tech, but since I don’t take many pictures, the iPhone 12 already felt like only a smalll update.
i would not be able to use 5G at all, because I use dual sim 24/7.
I am waiting for the next iPhone with hopefully real 5G (including international UW) support, 120hz and a smaller notch. That will feel much better
