Apple Begins Transition to Randomized Serial Numbers With Purple iPhone 12

MacRumors previously reported about Apple's plan to switch to randomized serial numbers for future products starting in early 2021, and this transition has now started with the new purple iPhone 12 model in multiple countries.

iphone 12 preorder purple
With assistance from Aaron Zollo, host of the YouTube channel ZolloTech, we can confirm that the purple iPhone 12 released last month has a new 10-character serial number format, compared to the usual 12 characters for most other Apple products. Apple previously said its randomized serial numbers would initially be 10 characters long, so the purple iPhone 12 appears to be the first Apple product with a randomized serial number.

The change likely extends to the purple iPhone 12 mini, but we've yet to confirm this. On the contrary, the randomized serial number format does not appear to apply to the AirTag at this time, with multiple MacRumors editors and others we've spoken to still seeing 12-character serial numbers for the item tracking accessory.

It remains to be seen if the new iMac, iPad Pro, and Apple TV have randomized serial numbers when they launch in the second half of May.

In a memo obtained by MacRumors in March, Apple said products already shipping at that time would continue to use the company's previous serial number format, which has for years allowed customers and service providers to determine the date and location that a product was manufactured. The first three characters represent the manufacturing location, the following two characters indicate the year and week of manufacture, and the last four characters reveal a device's model, color, and storage capacity.

The new serial number format will consist of a randomized alphanumeric string of 8-14 characters (10 characters initially) that will no longer include manufacturing or configuration details, according to Apple's memo. Apple advised authorized resellers to prepare for the transition to the new format ahead of its "Spring Loaded" event last month.

Related Forum: iPhone

Popular Stories

hikawa phone grip stand apple%402x

Apple Launches Second Limited-Edition iPhone Accessory in a Month

Friday November 21, 2025 3:53 am PST by
Apple has begun selling the Hikawa Phone Grip and Stand, a new limited-edition iPhone accessory designed with accessibility in mind. Designed by LA-based Bailey Hikawa to celebrate the 40th anniversary of accessibility at Apple, the grip uses magnets to securely snap onto any iPhone with MagSafe. Apple says it can be removed with ease, and doubles as a stand with two different viewing...
iOS 26

iOS 26.2 Adds These New Features to Your iPhone

Thursday November 20, 2025 10:50 am PST by
iOS 26.2 is currently in beta testing. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics for Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date. Keep reading...
Apple Shopping Event 2025

Apple Announces 2025 Black Friday Event, Here's What You Can Get

Thursday November 20, 2025 6:28 am PST by
Apple's annual four-day Black Friday through Cyber Monday shopping event is returning on Friday, November 28 through Monday, December 1 in many countries, including the United States, Canada, Australia, New Zealand, France, Germany, Italy, Spain, the United Kingdom, Belgium, the Netherlands, Sweden, Thailand, and others. During the shopping event, customers can get an Apple gift card with...
iOS 26 on Three iPhones

iOS 27 Will Reportedly Have Two Key Upgrades

Sunday November 23, 2025 8:48 am PST by
iOS 27 will reportedly have two major elements: quality improvements and new AI features. In his Power On newsletter today, Bloomberg's Mark Gurman said that iOS 27 will be similar to Mac OS X Snow Leopard, in the sense that Apple is focused on improving "quality and underlying performance" over adding new features. Gurman said there is one exception to this rule, though, as he expects...
maxresdefault

The MacRumors Show: iPhone 18 Pro Looks Like a Huge Upgrade

Friday November 21, 2025 9:10 am PST by
On this week's episode of The MacRumors Show, we talk through all of the new features and improvements expected to come to next year's iPhone 18 Pro and iPhone 18 Pro Max models. Subscribe to The MacRumors Show YouTube channel for more videos Apple's next-generation iPhones are less than ten months away and we already have a good idea about what to expect based on corroborated leaks, rumors,...
Apple Foldable Thumb

Foldable iPhone to Debut These Two Breakthrough Features

Wednesday November 19, 2025 7:26 am PST by
Apple's first foldable iPhone is expected to launch alongside the iPhone 18 Pro models in fall 2026, and it's shaping up to include two standout features that could set it apart from the competition. The book-style foldable will reportedly feature an industry-first 24-megapixel under-display camera built into the inner display, according to a recent JP Morgan equity research report. That...
ipad black friday 2025

The Best Early Black Friday iPad Deals

Thursday November 20, 2025 10:20 am PST by
Black Friday is just over a week away, and iPad deals have finally started to flood in at retailers like Amazon and Best Buy. Below we're tracking discounts on every current generation iPad, including lowest-ever prices on M3 iPad Air and M5 iPad Pro, plus steep markdowns on iPad and iPad mini. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a ...
General Black Friday Deals 25 Red

Apple Black Friday Deals Available Now on AirPods, iPads, Accessories, and More

Friday November 21, 2025 8:48 am PST by
We're officially less than one week away from Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these...
Low Cost MacBook Feature A18 Pro

Report: Low-Cost iPhone, iPad, MacBook Coming Early 2026

Friday November 21, 2025 2:26 am PST by
Apple is planning to release new entry-level models across its iPhone, iPad, and Mac categories early next year, with an all-new affordable MacBook the most notable addition to the lineup. According to a new research report by Jeff Pu of GF Securities seen by MacRumors, Apple will launch the iPhone 17e – its second iteration of the "e" line – in the spring, likely along with a...

Top Rated Comments

Xenomorph Avatar
60 months ago
So it's not a serial number, then.

Serial means in series. Randomizing a number by definition means it cannot be in series, so it's not a serial number.
Score: 45 Votes (Like | Disagree)
Eorlas Avatar
60 months ago
is there a particular reason for this transition? as in, if apple didnt want people to discern that info off a s/n, what is the need to obscure it?
Score: 21 Votes (Like | Disagree)
usagora Avatar
60 months ago

So it's not a serial number, then.

Serial means in series. Randomizing a number by definition means it cannot be in series, so it's not a serial number.
I'm guessing it technically IS a serial number, just "encrypted."
Score: 17 Votes (Like | Disagree)
pgiguere1 Avatar
60 months ago

So it's not a serial number, then.

Serial means in series. Randomizing a number by definition means it cannot be in series, so it's not a serial number.
Ackchyually...

The new serial numbers aren't truly random. They're generated using a complex pseudo-random deterministic function, for which the input is a series.

In general, computers don't produce true randomness, they try to approximate it, so this is true in many cases outside of Apple.

So, instead of being a conventional series like 1, 2, 3, 4..., it's a series of functions like f(1), f(2), f(3), f(4)..., which I think is still fair to call a series.

Edit: I saw someone refer to it as "still a serial number, but encrypted". This is kind of what they're doing indeed. True randomness on the other hand would not be decryptable. I am not sure if the current format is actually encrypted though (implying the function is bijective), or if it just outputs a hash.
Score: 11 Votes (Like | Disagree)
subi257 Avatar
60 months ago

So it's not a serial number, then.

Serial means in series. Randomizing a number by definition means it cannot be in series, so it's not a serial number.
That is completely true....I love logic.
Score: 11 Votes (Like | Disagree)
_Spinn_ Avatar
60 months ago

I'm guessing it technically IS a serial number, just "encrypted."
That would actually be a clever way to keep the serial number meaningful to Apple but useless to everyone else.
Score: 8 Votes (Like | Disagree)