Last week, The Information's Wayne Ma reported about a sophisticated fraud scheme in which organized thieves would buy or steal iPhones, remove valuable components like the processor or logic board, swap in fake components, and return the purposefully-broken iPhones to receive replacements they could resell.

serial number reader

iPhone Serial Number Reader

Apple became aware of the increasing fraud in 2013 and, in the years since, it has managed to "dramatically reduce" the rate of iPhone-related repair fraud in its retail stores, particularly in China, according to the report.

One of Apple's countermeasures was to develop diagnostic software that its retail employees could use to quickly detect fake parts in iPhones, the report said. To evade this tactic, however, many fraudsters started to intentionally disable the iPhones so they couldn't be turned on and subjected to diagnostics.

Fraudsters even went as far as obtaining Apple customer records, including serial numbers, for iPhones that had already been sold in China. In some cases, the incorrect serial numbers would be etched on the back of the iPhones.

To combat the use of stolen serial numbers, The Information reported that Apple came up with a screening method known as "Zombie Check" internally that tested whether serial numbers for the broken iPhones held for inspection were also associated with iPhones still using Apple's online services like iCloud.

According to an internal Apple document obtained by MacRumors, the tool was initially limited to China, but Apple began rolling it out to Apple Authorized Service Providers around the world in February 2018.

The aptly-named Serial Number Reader is a simple tool with a Lightning connector on one end and USB-A on the other. It is used to validate the serial number of an iPhone 6 or newer that will not power on by retrieving it directly from the logic board, although a source said it doesn't always work.

To use the tool, a technician connects the end with the Lightning cable to the iPhone and the end with the USB cable to a Mac running macOS 10.8.5 or later. Then, the technician launches the companion Serial Number Reader app on the Mac and the iPhone's serial number should appear in most cases.

serial number reader macos
The tool can retrieve serial numbers from iPhones that have been damaged in a variety of ways, including units with a non-functional display. Liquid damage is also no obstacle, so long as the liquid is no longer leaking out of the device.

Apple's internal document states that "serial number validation ensures warranty and service eligibility associated with a serialized device is appropriately applied." The document adds that "validation ensures Apple only offers warranty service on genuine Apple products," thwarting fraudsters.

Apple's efforts appear to be working. Apple's annual Form 10-K indicates that, in 2017, Apple's warranty expenses decreased to $4.32 billion from $4.66 billion a year earlier. The serial number tool, it would appear, is quite effective.

Top Rated Comments

PBG4 Dude Avatar
85 months ago
“Decreased to $4.32 billion from $4.66 billion” is considered effective? Seriously?
Since when is saving $340 million dollars not a big deal?
Score: 13 Votes (Like | Disagree)
estabya Avatar
85 months ago
LMAO it uses USB-A. They can’t even get to their own USB-C future.
Score: 13 Votes (Like | Disagree)
Canyonero Avatar
85 months ago
Does anyone at Apple ever wonder if being so embedded in China is the way forward? It’s literally the place where they have to bend over backward for everything, including this. What if everyone just said no, enough. Play by the rules and until you do, we are not doing business with you. I know it’s too late for that now but did no one really think of this? Everyone just thought we are going to smooth sail to China, have them do our stuff for cheap and that’s it, they won’t try to benefit?
Score: 4 Votes (Like | Disagree)
alexksj Avatar
85 months ago
Considering that at the same time Apple increased their sales by 6% (215 to 229 bil $), this gives you an effective decrease of 13% of warranty costs in proportion to sales.

$340 million seems a lot in isolation, but when compared to a sum in billions that’s like a 7.3% reduction. It doesn’t really show how effective it is. This 7.3% reduction may just be the fact that warranty claims reduced due to increased reliability of the new phones. If it’s in the region of a 15% or more reduction, it will be more believable that it’s this device being effective.
Score: 4 Votes (Like | Disagree)
garoto Avatar
85 months ago
Since when is saving $340 million dollars not a big deal?
How can we attribute all the savings to that tool? Can it be that maybe fewer claims were made? Or that year over year, all claims made aren’t worth the same $, or that iPhones are more reliable?

I’m sure the tool helped, but all $340 million attributed to it? I guess possibly if year over year warranty claims kept increasing as more and more iPhones were sold, and since the tool was released, it was decreased.
Score: 3 Votes (Like | Disagree)
alleggerita Avatar
85 months ago
Since when is saving $340 million dollars not a big deal?
$340 million seems a lot in isolation, but when compared to a sum in billions that’s like a 7.3% reduction. It doesn’t really show how effective it is. This 7.3% reduction may just be the fact that warranty claims reduced due to increased reliability of the new phones. If it’s in the region of a 15% or more reduction, it will be more believable that it’s this device being effective.
Score: 3 Votes (Like | Disagree)

Popular Stories

iPhone 17 Pro 3 4ths Perspective Aluminum Camera Module 1

iPhone 17 Pro Launching Later This Year With These 12 New Features

Sunday April 13, 2025 7:52 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 ...
Apple 2025 Thumb 1

10 Products Still Coming From Apple in 2025

Friday April 11, 2025 4:14 pm PDT by
Apple may have updated several iPads and Macs late last year and early this year, but there are still multiple new devices that we're looking forward to seeing in 2025. Most will come in September or October, but there could be a few surprises before then. We've rounded up a list of everything that we're still waiting to see from Apple in 2025. iPhone 17, 17 Air, and 17 Pro - We get...
iPad Pro iPadOS

iPadOS 19 Will Be 'More Like macOS' in Three Ways

Sunday April 13, 2025 6:43 am PDT by
A common complaint about the iPad Pro is that the iPadOS software platform fails to fully take advantage of the device's powerful hardware. That could soon change. Bloomberg's Mark Gurman today said that iPadOS 19 will be "more like macOS." Gurman said that iPadOS 19 will be "more like a Mac" in three ways:Improved productivity Improved multitasking Improved app window management...
Foldable iPhone 2023 Feature Homescreen

Foldable iPhone Resolutions Leak With Under-Screen Camera Tipped

Monday April 14, 2025 3:12 am PDT by
Apple's upcoming foldable iPhone (or "iPhone Fold") will feature two screens as part of its book-style design, and a Chinese leaker claims to know the resolutions for both of them. According to the Weibo-based account Digital Chat Station, the inner display, which is approximately 7.76 inches, will use a 2,713 x 1,920 resolution and feature "under-screen camera technology." Meanwhile, the...
M6 MacBook Pro Feature 1

Waiting for the Perfect MacBook Pro? 2026 Might Be the Year

Thursday April 10, 2025 4:19 am PDT by
Apple in October 2024 overhauled its 14-inch and 16-inch MacBook Pro models, adding M4, M4 Pro, and M4 Max chips, Thunderbolt 5 ports on higher-end models, display changes, and more. That's quite a lot of updates in one go, but if you think this means a further major refresh for the MacBook Pro is now several years away, think again. Bloomberg's Mark Gurman has said he expects only a small...
Apple Vision Pro with battery Feature Blue Magenta

Vision Pro 2 Rumored to Have Two Key Advantages Over Current Model

Sunday April 13, 2025 7:15 am PDT by
Apple is working on a new version of the Vision Pro with two key advantages over the current model, according to Bloomberg's Mark Gurman. Specifically, in his Power On newsletter today, Gurman said Apple is developing a new headset that is both lighter and less expensive than the current Vision Pro, which starts at $3,499 in the U.S. and weighs up to 1.5 pounds. Gurman said Apple is also...
maxresdefault

The MacRumors Show: New iOS 19, iPhone 17, and Apple Watch Ultra 3 Leaks

Friday April 11, 2025 7:13 am PDT by
On this week's episode of The MacRumors Show, we catch up on the latest iOS 19 and watchOS 12 rumors, upcoming devices, and more. Subscribe to The MacRumors Show YouTube channel for more videos Detailed new renders from leaker Jon Prosser claim to provide the best look yet at the complete redesign rumored to arrive in iOS 19, showing more rounded elements, lighting effects, translucency, and...
top stories 2025 04 12

Top Stories: iOS 19 and iPhone 17 Pro Rumors, Siri Revamp Turmoil, and More

Saturday April 12, 2025 6:00 am PDT by
It was a big week for leaks and rumors in the Apple world, with fresh claims about iOS 19, the iPhone 17 Pro, and even the 20th anniversary iPhone coming a couple of years from now. Sources also spilled the tea on the inner turmoil at Apple around the Apple Intelligence-driven Siri revamp that has seen significant delays, so read on below for all the details on these stories and more! iOS ...
iPhone 16e Feature

iPhones, Macs, and Other Apple Devices Exempted From Trump Tariffs

Saturday April 12, 2025 9:44 am PDT by
Apple and other electronics manufacturers have received a break from Trump's reciprocal tariffs, with the U.S. Customs and Border Protection agency sharing a long list of products excluded from the levies last night. iPhones, Macs, iPads, Apple Watch, and other Apple devices will not be subject to the 125 percent tariffs that have been put in place on imported Chinese goods, nor will Apple...