Wesley's Tool-Box

In my iPhone 6 Plus reviews, I've been focusing on the functions. But before wrapping this series up, I'd like to touch on the usability part. There will be a lot of existing iPhone users who's going to contemplate whether the huge screen is worth the risk. While iPhone 6 feels like a slightly enlarged iPhone 5S, 6 Plus is halfway to an iPad, a device that generally needs two hands to properly use.

Unlike an iPad, you can hold an iPhone 6 Plus with one hand just fine. This is due to its thinness and relative lightness. Using it in that manner is another matter, though. As you can see in the photo, the stretched screen of iPhone 5S (compared to 4S and earlier) already put some strain on the user's thumb when reaching the top corners. With iPhone 6 Plus, the thumb can realistically reach only about half of the screen area.


So what did Apple do about it? It added a feature called "Reachability" to iPhone 6 series. When you tap (not click) the home button twice quickly, the whole screen slides down half way for a while. This is supposed to let you be able to touch the unreachable area, enabling you to touch anywhere with one hand.

In practice, though, still doesn't fully solve my problem of reaching the opposite top corner with my thumb, where navigation buttons usually reside. This is because the phone became wider as it has become tall. I could temporarily adjust the grip, but that increases the risk of dropping the phone.

Some apps get around this problem by providing the edge dragging gesture for navigating backward and forward. Thanks to this, Apple's default apps like Safari can be used with one hand more or less okay. But there are still a lot of apps that don't support this. So in essence, the Reachability is more of a temporary fix for when you have no choice but to hold the iPhone 6 Plus with one hand. If you can, don't hesitate to hold the phone with two hands. It's much better that way.

As I mentioned in the previous VoLTE post, all three major mobile carriers in Korea have been supporting VoLTE for quite some time now. One glaring problem, though, is that cross-carrier VoLTE still hasn't been realized, despite years of negotiations. This seem to have introduced some confusion. The truth is that a device can always request a VoLTE call, but it's up to the network to decide to go with it, and if so, fully or just on the surface.

In the case of LGU+, the carrier's aging "2G" CDMA network had been a weak point, so it worked hard to have everything done on LTE, even voice. That's why it'll accept a phone that can do VoLTE even if it doesn't support the needed CDMA frequency band - namely, the iPhone 6 series. ( One caveat is that they are not accepted for registration on the network yet until official Korean debut. This is largely a decision of policy, not technicality. ) If you have such a phone, all calls will be connected as VoLTE no matter what.

But in case of SK Telecom (SKT) or KT, their "3G" WCDMA networks are still widely used. So they don't have the urge to go fully LTE. A call could still be made on either 3G or LTE, depending on the situation. No handsets on these networks get to make all of its calls on VoLTE.

Since I'm on SKT, I made calls to various phone numbers on my VoLTE phone, iPhone 6 Plus, to see how they end up connecting, and what quality they were.

Case	Caller 1	Caller 2	Connect 1	Connect 2	Quality
1	SKT VoLTE	SKT VoLTE	LTE	LTE	HD Voice
2	SKT VoLTE	SKT 3G (AMR-WB)	LTE	3G	HD Voice
3	SKT VoLTE	SKT 2G/3G	LTE	2G/3G	Normal
4	SKT VoLTE	KT / LGU+ VoLTE	LTE	LTE	Normal
5	SKT VoLTE	KT / LGU+ 2G/3G	LTE	2G/3G	Normal
6	SKT VoLTE	Landline (02 ~ 064)	LTE	Landline	Normal
7	SKT VoLTE	Toll Free (080)	LTE	Landline	Normal
8	SKT VoLTE	Special (15xx, 3-digit)	3G	Landline	Normal
9	SKT VoLTE	VoIP (070)	3G	Internet	Normal

As of this writing, two types of phones on the SKT network, the VoLTE-enabled phones (case 1) and the AMR-WB supported phones without VoLTE (case 2), can make end-to-end HD Voice-quality calls to and from iPhone 6 Plus. AMR-WB codec is the same codec used by VoLTE, but some phones support this only on 3G at a lower bitrate, e.g. iPhone 5 and Xperia Ray.

As mentioned earlier, cross-carrier VoLTE agreements are not yet in place, so calling VoLTE phones on other networks (case 4) ends up degrading quality. I'm hoping this clears up soon because there's no technical reason to be like this.

Meanwhile, most calls connect via LTE, with the exception of special numbers such as the three-digit numbers (including emergency) and the 15xx, 16xx numbers that companies use (case 8), as well as the VoIP numbers with the 070 area code (case 9). I understand that these numbers don't connect with high-quality codecs so LTE connection isn't necessary, but it doesn't explain why regular landline connections do connect via LTE.

Last year, iPhone 5S came with a motion co-processor called M7 that can collect various sensor data relating to iPhone's motion. The most notable use for this was recording how many steps a user took while carrying the device. In other words, the device acted as a pedometer. This year, iPhone 6 series has updated the co-processor to M8 and added another sensor - a barometer. The Health app that comes with iOS 8 makes an immediate use of this. It records how many floors the user has climbed, adding another dimension of knowledge to the user's movement.


Apps that are updated to use the Healthkit in iOS 8, such as Argus, can read this stair climbing data. The notification widget from Argus is able to display the number of floors I moved up during the day if I'm using an iPhone 6 Plus. If I'm using an iPhone 5S, there's no such data available, so the widget simply doesn't mention it at all.

While I'm comparing the data from both devices, I should note is that the pedometer function acted very similarly between each other. However, as you can see in the pictures, iPhone 5S consistently recorded a bit more steps than iPhone 6 Plus, for some reason. Perhaps the bigger form factor and weight of the 6 Plus dampened the recorded movement a bit.

Earlier, I've looked at how iPhone 6 Plus improved upon the image quality of the iPhone 5S. But it's not just the end result that's gotten better, but the process to get there, as well. Apple takes the whole photographing experience very seriously. One of the major improvements come in the form of the so-called "Focus Pixels", a marketing term for phase detection autofocus.

Traditionally, casual cameras employed contrast detection, which tries to pick out where the highest contrast difference between the pixels happens. Meanwhile, film cameras & DSLRs used the phase detection, which has the light from the subject split into two and tries to find where they become in-phase. The latter works well with continuous autofocusing, as well as in darker environments where contrast is less distinct.


In practice, the Focus Pixels provides the much-needed speed and accuracy improvements to the iPhone's autofocus. As you can see in the picture and the video above, iPhone 6 Plus locks onto the foreground subject's focus very fast and continuously. In contrast (no pun intended), iPhone 5S often does not respond to the movements of the foreground object.

When the iPhone 5S does detect the changes, the camera needs to move the focus back and forth, taking more time to find the right focus. In my experience with all the iPhones up to 5S, this occasionally results in focusing onto a wrong subject, even when I specifically selected the subject on the touch screen. This annoyance is no more on the iPhone 6 Plus.

What this means is that I'm now far less likely to have an out-of-focus snapshot even in a hurry. And I don't have to tell the iPhone to focus on something as often. A true "point and shoot", if you will.

It's already well known that iPhone's camera's quality usually ranks among the best in smartphones. iPhone 5S was no exception, so I wanted to see how iPhone 6 Plus could improve upon that. Naturally, I did a side-by-side photo shoot with the two phones for a few days and this is the result. All the photos here are cropped from the original resolution.

In the daytime shootings, the two performs more or less similarly at a casual glance. As you can see above, the details of the photos are very good and nearly identical to each other. I think it's a testament to how good the iPhone 5S already was.


That is not to say that iPhone 6 Plus hadn't had any improvements to introduce. As you can see in this photo, the details of the leaves receiving the sunshine are preserved better with the iPhone 6 Plus. Result from iPhone 5S looks more washed out despite having a slightly faster shutter speed. This shows that the dynamic range of the sensor has been enhanced. This is a good news if you don't want the somewhat unnatural look the HDR mode produces.