From the outside, the iPhone 4S looks almost identical to the iPhone 4. It's the same iconic shape, the same Braun- and Leica-inspired slab of glass and stainless steel. It may no longer be as fresh as it was when it debuted some 16 months ago, but it's still among the best designed and certainly the best built hardware on the market. It's also just as fragile, with chemically treated glass on both front and back, and an exposed antenna array all along the sides.
There are some small, subtle differences between iPhone 4S and iPhone 4. They're both 0.37 inches (9.3 mm) thin at 4.5 inches (115.2 mm) high and 2.31 inches (58.6 mm) wide but iPhone 4S is just a tad heavier at 4.9 ounces (140 grams). That's 0.1 ounces (3 grams) heavier than the iPhone 4 and iPhone 3GS.
Like the original AT&T/GSM iPhone 4, all iPhone 4S models have a microSIM tray. Like the later Verizon iPhone 4, the iPhone 4S has symmetrically aligned gaps in the external antenna array -- two on both sides.
All the buttons and ports are where you'd expect them. 3.5mm headset, noise-canceling mic, sleep/wake button, microSIM card slot (even on CDMA models, see below), speaker, 30-pin dock connector, phone mic, volume up and down buttons, and the ring/silent switch. On the front, below the screen there's still a home button. Above the screen is the ear speaker and the VGA camera. On the back is the LED flash and the new 8 megapixel still, 1080p video camera.
Sensors also remain the same, with aGPS, a digital compass, ambient light, proximity, accelerometer, and gyroscope.
Design evolution
While iPhone 4S is the 5th generation iPhone, it's only the 3rd major casing design in the product's history. Here it is compared to the original iPhone (2007) and the iPhone 3GS (2009).
8 megapixel, 1080p camera
Apple chose not to improve the front-facing iPhone camera. Even though Macs have gone to FaceTime HD in 1280x720 (720p), iPhone 4S remains disappointingly 640x480 (VGA).
The rear-facing camera is another story entirely. It's been increased to 8 megapixels and is capable of recording 1920x1080 (1080p) video. Apple has also improved the backlight sensor, added an f/2.4, wide angle lens to capture as much light and picture as possible, and added an extra piece of glass into the assembly to increase sharpness. There's also an infrared filter to improve colors, face detection for better exposure and focus on portraits, and image stabilization to keep your videos from shaking.
We asked our app editor and resident photographer, Leanna Lofte to put it to the test.
- Complete iPhone 4S 8 megapixel camera review
- Complete iPhone 4S 1080p video review
- iPhone 4S photography examples
Overall, the iPhone 4S did a phenomenal job with landscapes, especially considering the broad range of lights and darks. With HDR (high dynamic range) enabled, the results were excellent. The f/2.4 lens lacks manual controls but handles motion far better than last year's iPhone 4.
Face detection works impressively well, even when the subject is moving around and the face partially obscured. The improved backlight sensor does far better in low-light situations, capturing shots that were impossible with iPhone 4.
Macro photography, however, proved to be more of a challenge. They look great if focus locks on, but often the iPhone 4S fails to lock focus. This might be an iOS 5 issue, and if so, hopefully Apple will fix it in a future update.
The 5x digital zoom and flash are serviceable if you really need them, but are really only useful when you have no other options.
For video, the iPhone 4S 1080p camera did a terrific job adjusting between shade and light, though under bright backlighting the video remained slightly underexposed. Image stabilization worked well for walking and panning but couldn't compensate for more extreme motion like running.
Low-light was better than iPhone 4 but wasn't great. There was visible grain, and image stabilization didn't work as well in low light conditions, but iPhone 4S' ability to compensate for color distortion was impressive and a huge improvement over iPhone 4. Again, macro video was incredibly sharp but iPhone 4S had trouble locking focus on very thin objects.
Apple has also focused on reducing the time it takes to get your photo or video. You can now double click the home button and tap a new Camera button right on the lock screen to go directly to the Camera app (bypassing Passcode Locks, so beware of pranks if you leave it unattended). You can now also take photos with the Volume Up button. The time it takes the shutter screen to "open" -- previously a area of frustration -- is also dramatically faster. And, according to Apple, a dedicated Image Signal Processing chip speeds up picture taking, with the first photo taking only 1.1 seconds and subsequent photos taking only 0.5 seconds.
Overall, for impromptu, casual photo and video taking, low end point-and-shoots have just been made redundant. Even for special occasions, vacations and other events, non-photographers and non-videographers can realistically rely on an iPhone 4S and be well served. Apple has done a terrific job here, giving iPhone 4S an incredible new eye.
Antenna and reception
If iPhone 4 had an achilles heel it was the external antenna band. At 5 bars, touching the right antenna junction could drop it down to 3. At 1 or 2 bars, it could literally became a network pause-play button. Yes, the mainstream media blew it completely out of proportion, and a case made it go away completely, but it was a flaw.
And Apple has addressed it by adding a second antenna and giving the iPhone 4S the ability to intelligently switch between the two to make sure reception is more reliable, more often. It also doubles the previous HSPA 7.2 speed to 14.4 Mbps.
- iPhone 4S intelligently switching antenna hands on
The new Qualcomm RTR8605 chipset is technically HSPA+, but doesn't include the much faster HSPA+ 21 or 42 Mbps data speeds. So data is faster if not dramatically so. In most areas those top speeds remain theoretical anyway, but it's a shame people who can get them, can't get them with iPhone 4S.
For CMDA users on Verizon and Sprint, none of this matters anyway, because iPhone 4S is still stuck on the 3 Mbps EV-DO rev A network, with all the limitations that come with it. These will likely only be overcome in 2012 or beyond, when LTE 4G (Long Term Evolution) chipsets are thin and energy efficient enough to meet Apple's requirements.
However, the new Qualcomm chipset does support dual-mode CDMA/GSM. That makes it a world-phone, and means if you travel outside the US you can roam on international GSM carriers. Verizon and Sprint may even unlock the GSM radio for you, if you're a good enough customer and ask nicely enough. Then you can use a local microSIM when you travel and avoid paying data roaming altogether.
Even so, you can't switch between Sprint and Verizon, or put in an AT&T SIM and have it just work. The carriers are still locking that down. (Time will tell if the Jailbreak community can set it free.)
Here are the supported bands:
- UMTS/HSPA at 850, 900, 1900, 2100 MHz
- GSM/EDGE at 850, 900, 1800, 1900 MHz
- CDMA/EV-DO Rev. A at 800, 1900 MHz
The AWS 1700 MHz band used by T-Mobile the USA, and Wind, Videotron, and others carriers in Canada, is still missing. That means T-Mobile is now the last major carrier in the US without an iPhone to offer, and it means that if you do run an unlocked iPhone 4S on T-Mobile US, it can still only run on the old, slow EDGE 2G network.
Wi-Fi has stayed the same as last year, with 802.11b/g/n Wi-Fi. The 802.11n also remains 2.4GHz only. The Bluetooth radio on the other hand has gotten a boost and now supports Bluetooth 4.0, which offers lower power consumption and lower latency.
Speaker and mics
Every year we hope the inventor of the iPod will put a decent mic and speaker system into the iPhone, and every year we get made fun of by BlackBerry, and more recently, Android Beats users.
While there haven't been any audio announcements by Apple, or stage demos by Apple executives similar to the kind afforded the optics, iPhone 4S does show real signs of improvement. The speaker is louder and clearer, making it easier to do hands-free calls.
The noise canceling mic does an excellent job in keeping both phone conversations and Siri voice commands functioning even in busy, noisy rooms.
And the vibration motor, which has reportedly been redone in a linear rather than rotational arrangement, is less annoying when it goes off, yet every bit as noticeable.
Audiophiles might still be waiting for Phil Schiller to give them the attention photographers got this year, but for average users the sound is an improvement.
Apple A5 System-on-a-chip
The iPhone 4S gets the dual core Apple A5 system-on-a-chip (SoC) that was first introduced last spring alongside the iPad 2. Reportedly based on ARM's Cortex A9 central processing unit with Imagination's PowerVR SGX 543MP2 graphics processing unit, Apple will only say it provides 2x the computing power and 7x the graphics power of iPhone 4. This lets it power everything from AirPlay Mirroring to the Siri virtual assistant.
Doing bigger things isn't the only point, however. Doing more smaller things faster makes a difference as well. Launching apps, rendering and scrolling through web pages, playing games -- all these things are palpably faster. Near-instant, in fact. You'll feel it right away, and if you ever go back to an older iPhone or smartphone, you'll miss it immediately.
Interestingly, Apple's stuck with the same 512MB of RAM for the A5. While competing phones are sporting 1GB these days, Apple seems to believe they don't need more RAM for better performance, or perhaps don't need the potential tradeoff in power consumption. Given the immediateness of its feel and its ability to keep a large amount of everything from web pages to apps in ready and available, it's hard to argue. Still, developers will keep pushing the silicon and it would have been interesting to see what 1GB would have let iOS 5 games achieve.
Battery power
With the monstrous new Apple A5 SoC, and demanding new features like location-based Reminders and voice-crunching Siri, battery life should be a legitimate concern. Apple impressively claims very little change from the iPhone 4, though standby time seems to have taken a very large hit (down 33%).
- 3G talk time: 8 hours
- 2G talk time: 14 hours
- Web browsing: 6 hours
- Video watching: 10 hours
- Audio listening: 40 hours
In our tests it's hard to get a handle on. Reminders, Siri, and the other new features are so useful you end up using them more often, which leads to faster battery drain. If you stop using them (or turn them off in the Settings app), the battery seems just below iPhone 4 standards, but you lose out on all that great functionality.
If you charge frequently you can enjoy the best of both worlds, a phone doing what you need with power enough to do it when you need it. If you can't get to power, you'll have to moderate your usage.
We'll keep an eye on battery life going forward and update.
Accessory compatibility
While iPhone 4S is almost identical to iPhone 4, it's that almost that can get you. Depending on how well a manufacturer followed Apple's tolerance guidelines, most iPhone 4 cases should fit iPhone 4S, with Verizon iPhone 4 compatible cases likely providing the best fit. If in doubt, check into the specific case you want and ask about iPhone 4S compatibility
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