Siri's Impact on Data Usage Examined

With the release of the new Siri intelligent assistant on the iPhone 4S, some users have been curious about how much data the feature uses given that most users are on limited data plans and that Siri must communicate with outside servers in order to function. Ars Technica has now taken a look at a set of common Siri tasks, determined that those specific queries used an average of 63 KB of data.

siri icon on linen
The testing was broken down into two groups of queries, with the first being local queries requiring data only to interpret the spoken input. Data usage on those queries came in at an average of approximately 36.7 KB.

We performed six tasks that would be considered to be local tasks. These queries included things like, "Set an alarm for 3 hours from now," "Make an appointment for 2pm on Friday" (and then telling Siri to cancel the task), "Remind me to file expense reports when I get home," and "What is the contact info for Ars Technica?"

These tasks added up to a total of 220KB of data usage, or an average of 36.7KB per query. The actual numbers ranged from 60KB down to 18KB, and we believe this is correlated to the complexity of the specific query and language we used to perform it.

For more complex queries bringing results back from the Internet via Wolfram Alpha or Google, the average was 94.7 KB, with a range of 23 KB to 187 KB.

Summing up the data usage, Ars Technica calculated that a user performing all eleven of the sample queries via 3G every single day would consume approximately 20 MB of data in a month. Informal surveys of typical Siri usage revealed that even high-use customers tend to come in at about fifteen queries per day, which would represent in the neighborhood of 30 MB of data per billing cycle depending on complexity of requests.

Most carriers offer customers easy ways to check their current and historical data usage, helping them gauge how much cap space they typically have as they consider how Siri usage will affect their data needs.

Related Forum: iPhone

Popular Stories

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

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...
iPhone 17 Pro Cosmic Orange

10 Reasons to Wait for Next Year's iPhone 18 Pro

Wednesday November 19, 2025 4:00 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
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...
ipad mini 7 feature red and blue

iPad Mini 8: Four Major New Features to Expect

Wednesday November 19, 2025 7:50 am PST by
Apple's eighth-generation iPad mini is highly likely to arrive next year, offering a significant refresh of the device with at least four major new features. OLED Display The next-generation version of the iPad mini could feature an OLED display, as part of Apple's plan to expand the display technology across many more of its devices. Apple's first OLED device was the Apple Watch in 2015, ...
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 ...
watchos 26 workout app

Apple Watch Users Claim Workout App Is Now Worse in Every Way

Thursday November 20, 2025 7:01 am PST by
Apple Watch owners have been voicing their frustration online over changes to the Workout app that Apple introduced in watchOS 26, with many finding the redesigned interface makes starting exercises difficult and exasperating. When Apple launched watchOS 26 in September, the Workout app went from large, easily tapped workout tiles to a scrolling, corner-button interface. Instead of tapping a ...
applecare apple care banner

Apple Brings New AppleCare+ Options to India

Tuesday November 18, 2025 8:42 am PST by
Apple today announced an expansion of AppleCare+ coverage in India, with new options for monthly and annual plans, and the addition of Theft and Loss for iPhone for the first time. Options for monthly and annual AppleCare+ plans in India provide more choice and flexibility, allowing users to keep coverage for as long as they require. Apple's vice president of Worldwide iPhone Product...
apple wallet drivers license feature iPhone 15 pro

Two More U.S. States Commit to Offering iPhone Driver's Licenses in Apple Wallet App

Thursday November 20, 2025 8:21 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. Earlier this week, Illinois became the 13th state in the U.S. to offer the feature. Subsequently, we shared a list of additional states that are committed...

Top Rated Comments

bettaboy123 Avatar
183 months ago
30 MB a month isn't too bad at all. :)
Score: 12 Votes (Like | Disagree)
Eager Beaver Avatar
183 months ago
Love my 4S but I don't really use Siri for much other than "Call John Doe" tasks, once in a while. Am I the only one who is so luke warm about this feature??




I've used it daily since new, and find myself using it more and more.
What a great tool siri is ......... set a reminder for tomorrow 11am, message Tom, "Ill b there in an hour", call napa, remind me to put the defrosted ground beef in the refrig when I get home, .................... oops, gotta run, the timer siri set for me just went off, I have to leave to go meet my friend.

Being able to push and hold 1 button, and then tell siri to do things (while I am busy myself, doing things with my other hand and not wanting to scroll thru my iphone with two hands trying to send Tom a message.

Siri is the ONLY reason i bought this bs iphone 4, and I'm actually very impressed with her.
Score: 11 Votes (Like | Disagree)
SafariX Avatar
183 months ago
Not a lot of data being used. Who cares
Score: 10 Votes (Like | Disagree)
AriX Avatar
183 months ago
Good research. Thanks Ars.
Score: 10 Votes (Like | Disagree)
atticus18244fsa Avatar
183 months ago
Doesn't that mean that a heavy user (and using Siri only 15 time a day is not really that heavy) would use 900 MB+ of data per month just using Siri? With AT&T and Verizon switching to 2GB caps, that means have your data is used up just from using Siri. :eek:

Maybe Apple needs basic commands like setting appointments and alarms to be integrated in iOS so those commands don't have to go through the internet. :)

30MB per month not per day.
Score: 8 Votes (Like | Disagree)
StyxMaker Avatar
183 months ago
It sounds excessive, but most people are in wi-fi zones during the day. Most offices, schools, college campuses, hospitals, airports, even shoppings malls are all wi-fi enabled (and mostly free).

And if Siri is the only person you talk to while sitting in rush hour traffic, then you've got bigger problems than your data plan.
Only Siri, and the voices in my head. Sometimes it's hard to tell the difference. I think Siri is getting jealous, she told me I had to stop talking to the other voices.
Score: 7 Votes (Like | Disagree)