WiFi Performance

While cellular data is often the center of smartphone connectivity, it’s often the case that people rely on WiFi instead of cellular data for the bulk of their data transfers. As a result WiFi is a pretty important part of the overall smartphone experience. In the case of the iPhone 6s, the major change from the iPhone 6 is that rather than single stream 802.11ac, the iPhone 6s now has dual spatial stream 802.11ac. This increases the maximum physical link rate to 867 Mbps. There’s been some confusion over what’s used for the WiFi chipset, and as far as I can tell this is definitely a Broadcom solution, which is identified as BCM4350 in the system judging by the device ID. This chipset is shared with the Macbook, which is probably helpful for driver development. In order to test how well this performs, we use iperf2 in UDP mode to attempt to determine maximum practical bandwidth. It’s worth noting here that the iperf2 ports on iOS are still amazingly buggy though, so these results are no guarantee as far as I can tell.

WiFi Performance - UDP

Interestingly enough, for whatever reason the iPhone 6s holds a minor lead over most of the other devices in this test. I’m not sure what’s causing this, but in practice I found that WiFi on the iPhone 6s worked without any noticeable issues. Reception is noticeably improved when compared to the iPhone 6 due to the addition of a second spatial stream which means that throughput at the same distance is higher.

GNSS

Accurate location is often critical to a number of popular applications for smartphones like any kind of navigation or mapping application, which is going to be an incredibly painful experience if the GNSS system in the phone has poor sensitivity to the signals used in the various GNSS systems available today. Although I have no hard evidence to go on, given the use of a Qualcomm modem in this phone I strongly suspect that this phone is using Qualcomm's IZat location services. I would normally run some cursory testing here with a GPS test application, but because iOS offers no way to clear assistance data and location services are disabled if there is no prior connection to download assistance data, there's no way to do the usual cold lock testing.

A warm lock in which connection was immediately established to begin downloading assistance data achieved lock within 15 seconds, and in general I've never had issues with location services in the iPhone 6s in my time using it.

Misc

Over the course of the review, there are a lot of various bits and pieces that I learn about a phone that might be of interest, but aren’t necessarily examined in intense depth because of either limitations in our testing or the issue of interest isn’t significant enough to examine closely. For example, the fuel gauge appears to be a TI design win as there are references to a BQ27540 chip. The A9 SoC also contains a dedicated AES accelerator for things like full disk encryption and FairPlay DRM. The display backlight appears to use the TI LM3539 driver, but other evidence within the system suggests that this isn’t the only backlight driver for the display.

On the audio side of things, although I haven’t been able to do deep investigations into audio quality it appears in the system that the audio codec used is Cirrus Logic’s CS42L71 which also appears to be responsible for microphone input. However, instead of using an amplified on the audio codec a dedicated amp is used for the speaker, which appears to be a Cirrus Logic CS35L21. Subjectively, the speaker sounds pretty similar to the iPhone 6, but at the high end of the volume range it feels like volume was increased while also increasing distortion. Turning down the volume to a comparable level makes both sound pretty much the same.

More reading of the system files reveals some noticeable codenames like Stockholm which appears to be related to NFC and payments in some way. The fingerprint sensor is referred to as Mesa, and the authentication/secure element appears to be Sand Dollar. The charger chip is referred to either as SN2400 or Tigris. Some sort of accessory detection chip is referred to as TriStar2 or CBTL1610. The ambient light sensor is referred to as CT821 but I can’t find anything on what this is at all.

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  • nerd1 - Saturday, November 7, 2015 - link

    720p screen in 2015, worse battery life, no sd slot, no wiress charging, terrible camera and still THE BEST phone huh?

    It has best performing processor, no one argues that, but I still wont touch it with a stick.
  • JaytB1 - Sunday, November 8, 2015 - link

    I use iPhone mainly because of the better security/privacy, no carrier/manufacturer delay/total dismissal of security/OS updates, earlier/exclusive/better releases of triple A games/apps and uncluttered interface. I agree with the gold award, the iPhone 6s (plus) is the first phone in a while that made me see that there are still possibilities to innovate in the smartphone space.

    I've seen Android users avidly defending their high PPI's, megapixels, core counts. Oh, but it's customizable and I can put a ton of widgets on my homescreens. There's only a small minority of tech obsessed people who care (proof is in the huge low/medium end market share, indicating the amount who don't care for specs but just want a working phone). For me, all I want is to launch an app, not stare at my home screen. In the past, Android users where more often than not boasting about benchmarks and how their hardware was superior. Now that the tables are turned, hardware all of a sudden doesn't matter as much anymore or the tests must be rigged by a biased Anandtech (who has nothing to gain and everything to loose if they were posting nonsense).

    I've seen Samsung and other manufactures add so many gimmicks to their phones, many of which are plain impractical (try doing 'airview' while jogging and you'll get the picture).
    I admit that fast charging would be nice but, for me, completely unnecessary (it's not like an iPhone charges slow in the first place).
    Then there's wireless charging, you do realize that you still have to plug in the charge pad with a cable right? So the only difference is that you don't need to plug that cable into your phone, but you'll need more power to fill your device up as compared to using a cable (more waste power) and a permanent spot for your charging pad. Again, for me I don't really see the appeal for that either.
    We could also talk about PPI but to keep it brief, I'd rather have a device perform well with individual pixels I can't distinguish, than a screen that would impact performance with pixels I still can't see... But more of them.
    I could go on about how a blind photo evaluation test on a respected Android site had Android users voting the iPhone 6s as having the best overall picture quality, but now that the iPhone scored a tiny bit lower than some Android phones in one test, it suddenly has a 'far inferior' camera. Then there's the RAM, curved screens and so many other things I could mention, but my point is that I think Android users can't recognize a genuine game-changing feature-list because they're so used to getting bombarded by tons of arguably useless high spec lists and gimmicks that are marketed as 'the next big thing'.
    It's almost as if Google took over the reality distortion field from Apple. Just wait a couple of years when all Android devices have 'Android sense' (or something) displays (3D touch), THEN it will be a game changing feature because they'll have 1000's of pressure levels they can sense as compared to the 'useless' iPhone's (hypothetical) 128 levels.

    Don't get me wrong here, I'm not trying to bash Android or people who choose to use it, I just don't like those who post nonsense without anything to back it up just so they can sleep at night having convinced themselves that they bought the right phone. I've been a reader of this site for years and believe their test results to be correct, as they've always been. People who claim otherwise should come with facts or stop sprouting nonsense.

    I, for one, agree with the review and think it's the phone with the best all round feature set on the market today. Is it perfect? Of course not, but it's a genuinely forward thinking and exceptional smartphone in a stale smartphone market, and that deserves that gold award in my book.

    Thanks for the review!
  • Aritra Ghatak - Sunday, November 8, 2015 - link

    As the reviewers pointed various aberration and distortions associated with using a brighter lens and that it is wise Apple went with the F 1/2.2 aperture lens. Could you please explain how Samsung manages with an F 1/1.9 aperture lens in Galaxy S6? Or for that matter the F 1/1.8 lens in LG G4 or Nokia Lumia 720/730?
  • patamat - Sunday, November 8, 2015 - link

    Well, we all know who Anand went to work for after writing few "balanced" reviews like this one.
    (apple ...)
  • Psymac - Monday, November 9, 2015 - link

    Where is the phone function analysis of this iPhone?
  • zimmybz - Tuesday, November 10, 2015 - link

    I guess I'll try to build the bridge for the Droid guys here that are having a hard time.

    I haven't had an iPhone since the Galaxy S came out. Been a droid user since.

    I recently got a 6S Plus. I sold a Note 5 and cancelled a pre-order for a Nexus 6P.

    I will say it since nobody else will. The Note 5 has a great camera, S-Pen is cool, and enough RAM to keep multi-tasking running, but otherwise it's a shitty phone. The battery life and Touchwiz still leave a LOT to be desired. Build quality is great, but it suffers from what every other Droid phone suffers from - fractured, fragmented hardware eco-system and specs driven production. (Hang on)

    If you need to know why you should cancel a 6P pre-order, look at the subreddit (Holy crap, lol.)

    Anyways, in my first week with the 6S Plus, I hit 22% battery with 88 hours standy and 13 hours usage. That is completely insane.

    Back to the Note 5 - look at the graphs on the review here. This phone absolutely DOMINATES the Note 5 across the board, a fact which I can confirm first hand.

    I can also tell you that holding the phones side by side looking at the same picture taken on the Note 5, the displays are functionally indistinguishable from the other. (So much for all that resolution, I guess)

    This is a large reason why the Note stutters against the 6S Plus. It's pushing a LOT of pixels that aren't really evident in day to day use, especially sitting next to the iPhone.

    I guess I finally reached the point, I just want the best phone every year regardless of manufacturer or software.

    Until Google makes it's own hardware in house and breaks free of QualComm, Apple is going to beat them every year going forward. I'm not 20 anymore, I don't care about a home screen widget. I want the battery not to drain from some stupid Google Play Services memory drain while the phone is sitting on my desk.

    I don't want Samsung Services blowing up the battery either. And - NO - I should not have to root kit, Package Disable, Power Saver, Turn off Location, etc, etc, etc. I paid $1000 for a premium handset with lots of features.

    Oddly enough, the iPhone can leave all that crap on and STILL get good battery life. The arguments for Android are shrinking right now. I'll never buy another Samsung phone again. I will miss the S-Pen, but Touchwiz is heinous, even in it's current iteration.

    I would really love to see Google put up a fight in the premium handset market, but I don't think their hearts are in the hardware QUITE yet.

    Anyways, happy 6S Plus user here, 4+ year droid convert at the moment. We'll see what next year brings.
  • zeeBomb - Wednesday, November 11, 2015 - link

    Ss or bs (sorry I just had to)
  • JTRCK - Friday, November 13, 2015 - link

    I actually returned a 6S Plus for the Nexus 6P and the main reason was PRICE. They are as equally performant in day to day tasks, but the Nexus 6P had better multitasking performance for me due to the buttons and added power of a side launcher which is not possible on iPhone. I basically never have to go to the home screen again when using Google docs, searching the web, etc... I tried both out for about a week. The only feature I liked on the iPhone 6S Plus better was the cooler white colors of the LCD; other than that the Nexus 6P was better "for me" in every aspect. The phone "flies" in every sense of the word. No stutters, no lag, no unresponsiveness (typical of Samsungs). I have been an iPhone user since the 3GS. I also used the iPhone 6 Plus this year for 5 months.

    And I truthfully don't understand all this commotion over the new iPhone 6S Plus being the best phone ever released. Outside of "3D touch," there is not much difference in day to day performance or general use between both this year's model and last year's model. That is generally a great testament to iOS stability and performance. So much so that my old iPhone 4s opened apps faster, surfed faster, multitasked faster, etc, than my now defunct Note 4. Apple has been on top of their game for years, IDK why android fans have only now noticed. But iOS is truly very limited. You will sooner or later find out the gates keep you truly locked in.

    But the main factor for me, again, was price. I do not in any way find the iPhone to be a better phone than the Nexus 6P. In fact, I find its system to be inferior in a multitude of ways. Is the iPhone Better than the Note 5 and all its clumsy and useless features? Yes. But the Nexus 6P is in a category all its own. Especially for $650. That is exactly what I paid for the 128GB model compared to the $1,170 I paid for the iPhone 6S Plus.
  • astroboy888 - Wednesday, November 11, 2015 - link

    "FinFET transistors are necessary because as transistors get smaller their leakage (wasted power) goes up, and without FinFETs leakage would spiral out of control. In fact that’s exactly what happened on the 20nm nodes from Samsung and TSMC; both companies thought the leakage of planar transistors could be adequately controlled at 20nm, only for leakage to be a bigger problem than they expected"

    It is not they "discovered" 20nm leakage was high; therefore they switched to 16nm FinFet. This is an incorrect comment.

    FinFet transistors structure had been on the road map and in development at TSMC for more than 10 years. TSMC's first finfet transistor was demonstrated in 2002 when the inventor Professor Chen-Ming Hu of UC Berkeley was working at TSMC as CTO. Therefore Finfet process had always been on the roadmap for 16nm process. The 20nm planar process had always been on the road map as a planar process. Every process node takes about 3-5 years to develop, so the customers (semiconductor chip designers) signs up 3-5 years before hand to co-work with TSMC to design a chip for that process. These were communicated ahead of time and contracts where signed.

    In the late 1990s and early 2000s, the semiconductor industry was pushing for SOI (Silicon On Insulator such as GaAs "Gallium Arsenide), which completely eliminates leakage current. But the transistor performance turned out to be too unpredictable and too expensive to manufacture. Therefor the industry stuck with silicon, until FinFet structure was invented in 2000 and manufacturing process perfected some 10 years later.
  • gonsolo - Thursday, November 12, 2015 - link

    If I may suggest something: I'd like to see app startup times as a benchmark from iPhone 5 onwards. This is something I'm doing a lot; waiting for apps to start.

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