Don't Buy the BS: iOS 8 Works Just Fine on iPhone 4S
Shortly after the official release of iOS 8, news outlets like BGR, Gizmodo, and Huffington Post were instructing iPhone 4S users to refrain from updating (which were practically regurgitations of an Ars Technica piece).
I'm not here to sway you in one direction or the other, but I will offer my honest impression as an actual 4S user who not only tested each iOS 8 beta as it came out, but is currently running the public build of the new operating system.
Yes, it is time for a new phone, but until then, here's to all you 4S owners curious about updating to Apple's latest OS.
Proper Bluetooth support (for new Hand Off feature)
Smaller Screens Are Still Cool
It's been said that the 3.5-inch display on the 4S is not nearly large enough to support iOS 8, like the Mail app for example, which leaves little room to compose an email with suggestive text enabled on your keyboard.
 Feeling cramped?,  Just change your keyboard!
This is all bullshit. I can see my drafts just fine, and if you think it's an issue, use a minimal, third-party keyboard, like Fleksy, that can add more screen real estate.
Another small feature that I noticed I'm missing is location-based app suggestions, but I'm actually grateful that I don't receive those on my lock screen—I don't need to be reminded just how close I am to McDonalds.
It Really Doesn't Slow Down Your Device All That Much
4S-ers, must keep in mind that compared to newer iPhones, our device is indeed slower—but that was the case with iOS 7, too. While the iPhone 6 comes with an Apple A8 chip, and the 5S shipped an A7, the 4S came with a now underwhelming A5. Not only that, but it does not support 4G/LTE data. So yeah, it's slower—but you knew that.
While the iPhone 4S is the proverbial runt of the litter, Apple did state in their keynote that iOS 8 would support the 4S. I doubt their team would include that graphic if the device didn't pass internal functionality testing.
Previous arguments claimed that iOS 8 created noticeable lag, but it isn't that drastic. Check out the chart below from Ars Technica, which gives a better indication of how much slower the 4S runs by comparing the time it took to open apps on iOS 7.1.2 versus iOS 8.
I realize my phone is older, so it isn't going to look all that great compared to a newer device, especially the iPhone 6, but that doesn't mean you need to listen to people telling you not to update. Chances are they're not sporting the 4S like you are, so weigh the pros and cons, then decide for yourself—we're just here to help.
Cool with iOS 8 on Your iPhone 4S? Check Out What Else You Can Do