Technologies

How CNET tests phones

What goes into a CNET smartphone review

Phones are much more than communication devices; they’re our gateway to the internet. They’ve become the center of our daily lives, housing our personal information, work essentials, personal memories and enabling us to reflect our personalities online. That’s why CNET conducts rigorous tests to help you find the right phone for your budget and needs.

When reviewing phones, we take a variety of factors into account such as camera quality, battery life, design, software and longevity. Every phone is different, but our testing allows us to answer the same question in each review: Is this phone worth buying? We evaluate phones based on the quality of their hardware and software, whether they introduce any meaningful new innovations and whether they’re the right price.

We replace our personal phone with the test unit during the review period so that we can get an accurate impression of what it’s like to rely on the device for daily tasks. In addition to this anecdotal usage, we also conduct specific side-by-side tests against other phones as part of the evaluation process.

We generally test phones against their immediate predecessor, competing phones from other companies or another phone within the same product line (for instance, iPhone 14 versus iPhone 14 Pro). We focus on whichever comparisons are most useful for helping our readers navigate the buying decision, and that may vary depending on the phone. Whenever possible, we work all three types of comparisons into a review.

Some of these methodologies are relatively new to CNET’s testing procedures, so you may not see them in all of our reviews from 2022. We’re in the process of updating our current reviews with these tests and plan to implement them fully in 2023.

Below is a general overview of what goes into a CNET smartphone review.

Testing smartphone cameras

The camera is the biggest area where companies like Apple, Samsung, Google and OnePlus typically make improvements to new models each year, and our reviews put phone maker’s claims to the test. We take photos in a variety of circumstances and lighting conditions, including bright outdoor areas, dim indoor settings and mixed lighting.

We capture a variety of subjects (objects, pets and people) to assess boldness, sharpness, skintones and color accuracy. We test all of the phone’s main lenses (wide, telephoto and ultrawide), front-facing cameras as well as different shooting styles, like portrait mode and night mode. Our reviews also cover useful editing features or shooting modes that are specific to the device, such as the Google Pixel 7’s Face Unblur or the iPhone’s Cinematic Mode.

Part of these tests include side-by-side photo comparisons between the phone we’re reviewing and previous phones we’ve tested. We evaluate a phone’s cameras on their consistency as well as how they stack up against the competition. All photos are straight out of camera and accessed without any edits, unless specifically noted. Beyond the initial impressions we get from viewing these photos on a phone’s screen, we also upload them to a computer and view them alongside one another on a monitor. This reduces any bias that may come from the different screens on each phone. It also makes it easier to view discrepancies in clarity and color between each photo.

We also capture video with the review phone and judge it on its image and audio quality. Just because a phone can capture 6K or 8K video doesn’t mean it’s good. Unlike the computational photography algorithms that Google, Apple, Samsung and others apply to photos, videos remain relatively less processed, making it easier to critique a camera’s strengths and flaws.

Testing smartphone performance

The performance section of our reviews examines how responsive phones are in everyday use, how well they juggle multiple tasks and how they fare during benchmark tests.

We do this by observing how quickly phones can open apps and launch the camera. We also note whether the phone has an adaptive refresh rate setting and how this improves performance if at all (for example, whether this makes animations and scrolling feel smoother). We also look for signs of lag when running multiple apps (such as using a social media app or playing a game while on a video call), or playing an online multiplayer game with the highest graphics settings.

In addition to these everyday tasks, we also run a series of benchmarks designed to test a phone’s computing power and graphics performance. These tests include Geekbench 5 for general CPU performance and 3DMark Wild Life Extreme for graphics. We also run the same tests on other phones that we’re comparing our test device to.

Testing smartphone battery life

We test battery life in three ways: through an anecdotal stress test, a video streaming test and by observing battery life after everyday use. As noted earlier, these tests are relatively new and we’re still in the process of adding them to our 2022 reviews.

The anecdotal stress test measures how much the battery drains after 45 minutes of general usage. We do a little bit of everything during this test to mimic authentic everyday experiences. That includes streaming video, using social media apps, playing a game, making a video call and other miscellaneous tasks like checking email. After this 45 minutes of mixed usage, we mark down the percentage of battery drain. To keep the test consistent between phones, we perform each of those tasks for roughly 10 minutes. We also keep the screen brightness set to 50%, turn off the always-on display and keep the high refresh rate setting on (if there is one).

The streaming test monitors how much the battery drains over a three-hour period while viewing a video on YouTube. We use the same video each time for consistency and set the screen brightness to 100%. We also disable settings that automatically dim or brighten the screen, connect to Wi-Fi and turn on the adaptive or high refresh rate setting if applicable. We take battery percentages at the one-hour, two-hour and three-hour marks.

Since we use test phones as our regular devices, we also discuss how long the battery has lasted in everyday use based on our experience. Often, our practical experience with a phone’s battery life can give us the most accurate prediction of what others might expect if they bought the same phone.

Testing smartphone design, software and display

Our smartphone reviews also encompass other areas like design, software and display quality. Design can be subjective, but we generally look for factors such as durability (water and dust resistance ratings), how easy the phone is to operate with one hand, the build quality and whether the design is unique or interesting in any way. For display quality, we’ll mention factors like brightness, how easy it is to see in sunlight and sharpness and color.

Software is another key part of CNET’s smartphone reviews. We mention any new or noteworthy features and how long the phone will support new versions of Android (or iOS respectively) and security updates.

Our written review tells you everything we feel and experienced, but we also give each phone overall score and star rating to provide a different context. A $450 phone might lack all the features that a $1,000 phone has, but its value might mean it gets a higher score. We also update these ratings based on a variety of factors, including software changes and quality control issues.

Reviews will always vary depending on the device, but these are the core tenets that make up a CNET smartphone evaluation. Determining a phone’s overall value is our guiding principle in every smartphone review. Our reviews shed light on whether a new phone lives up to its expectations, who the phone is for and whether it delivers on its promises for the price. We are always evaluating our own testing methodologies and looking for ways to improve, so expect to see more updates in the future.

Technologies

iOS 17 Cheat Sheet: Your Questions on the iPhone Update Answered

Here’s what you need to know about new features and upcoming updates for your iPhone.

Apple’s iOS 17 was released in September, shortly after the company held its Wonderlust event, where the tech giant announced the new iPhone 15 lineup, the Apple Watch Series 9 and the Apple Watch Ultra 2. We put together this cheat sheet to help you learn about and use the new features in iOS 17. It’ll also help you keep track of the subsequent iOS 17 updates.

iOS 17 updates

Using iOS 17

Getting started with iOS 17

Make sure to check back periodically for more iOS 17 tips and how to use new features as Apple releases more updates.

17 Hidden iOS 17 Features You Should Definitely Know About

+15 More

See all photos

Technologies

Get Ready for a Striking Aurora That Could Also Disrupt Radio Communications

Don’t expect the storm to cause a lingering problem, though.

A geomagnetic storm is threatening radio communications Monday night, but that doesn’t mean you should be concerned. In fact, it may be an opportunity to see a colorful aurora in the night sky.

The National Oceanic and Atmospheric Administration has issued a geomagnetic storm watch after witnessing a coronal mass ejection from the sun on Saturday. The watch, which was issued over the weekend and will expire after Monday, said the onset of the storm passing over Earth on Sunday night represented a «moderate» threat to communications. As the storm continues to pass through, it could deliver a «strong» threat on Monday night that could cause radio communications to be temporarily disrupted during the worst of it.

Even so, NOAA said, «the general public should not be concerned.»

A coronal mass ejection occurs when magnetic field and plasma mass are violently expelled from the sun’s corona, or the outermost portion of the sun’s atmosphere. In the vast majority of cases, the ejection occurs with no real threat to Earth. However, in the event the ejection happens in the planet’s direction, a geomagnetic storm occurs, and the Earth’s magnetic field is temporarily affected.

In most cases, geomagnetic storms cause little to no disruption on Earth, with radio communications and satellites affected most often. In extreme cases, a geomagnetic storm can cause significant and potentially life-threatening power outages — a prospect that, luckily, the planet hasn’t faced.

Switching poles

Every 11 years, the sun’s magnetic poles switch, with the north pole and south pole swapping positions. During those cycles, the sun’s activity ramps up as it gets closer to pole-switching time. The height of its activity is called solar maximum, and scientists believe we either may be entering the solar maximum or may be already in it.

During periods of heightened solar activity, sunspots increase on the sun and there’s an increase in coronal mass ejections, among other phenomena. According to NOAA, solar maximum could extend into October of this year before the sun’s activity calms and it works towards its less-active phase, solar minimum.

Even when geomagnetic storms hit Earth and disrupt communications, the effects are usually short-lived. Those most affected, including power grid operators and pilots and air traffic controllers communicating over long distances, have fail-safe technologies and backup communications to ensure operational continuity.

But geomagnetic storms aren’t only about radios. In most cases, they also present unique opportunities to see auroras in the night sky. When the storms hit, the plasma they carry creates a jaw-dropping aurora, illuminating the night sky with brilliant colors. Those auroras can be especially pronounced during the most intense phases of the storm, making for nice stargazing.

If you’re interested in seeing the aurora, you’ll need to be ready. The NOAA said the «brunt of the storm has passed» and even if it lingers into Tuesday, there won’t be much to see after Monday night.

Technologies

Last Total Solar Eclipse for 20 Years Is Coming: How to See and Photograph It

It’s your last chance until 2044.

Get your eclipse glasses ready, Skygazers: the Great American Eclipse is on its way. On April 8, there’ll be a total eclipse over North America, the last one until 2044.

A total solar eclipse happens when the moon passes between the Earth and the sun, blocking the sun and turning an otherwise sunny day to darkness for a short period of time. Depending on the angle at which you’re viewing the eclipse, you may see the sun completely shrouded by the moon (called totality) or some variation of it. The more off-angle you are and the further you are from the path of the eclipse, the less likely you’ll be to see the totality.

The 2024 total solar eclipse will happen on Monday, April 8. The Great American Eclipse will reach the Mexican Pacific coast at 11:07 a.m. PT (2:07 p.m. ET), and then traverse the US in a northeasterly direction from Texas to Maine, and on into easternmost Canada. If you want a good look at it, but don’t live in the path of totality, you shouldn’t wait much longer to book accommodation and travel to a spot on the path.

Or how about booking a seat in the sky? Delta Airlines made headlines for offering a flight that allows you to see the entire path of totality. Its first eclipse flight, from Austin, Texas, to Detroit sold out quickly. But as of Monday, Delta has added a second flight from Dallas to Detroit, which also covers the path of totality. The airline also has five flights that will offer prime eclipse viewing.

Not everyone can get on one of those elusive eclipse-viewing flights. Here’s a look at other options to nab a chance to see this rare sight and what to know about it.

Total solar eclipse path

The eclipse will cross over the Pacific coast of Mexico and head northeast over mainland Mexico. The eclipse will then make its way over San Antonio at approximately 2:30 p.m. ET on April 8 and move through Texas, over the southeastern part of Oklahoma and northern Arkansas by 2:50 p.m. ET.

By 3 p.m. ET, the eclipse will be over southern Illinois, and just 5 minutes later, will be traveling over Indianapolis. Folks in northwestern Ohio will be treated to the eclipse by 3:15 p.m. ET, and it will then travel over Lake Erie and Buffalo, New York, by 3:20 p.m. ET. Over the next 10 minutes, the eclipse will be seen over northern New York state, then over Vermont. By 3:35 p.m. ET, the eclipse will work its way into Canada and off the Eastern coast of North America.

Best places to watch the Great American Eclipse

When evaluating the best places to watch this year’s total eclipse, you’ll first want to determine where you’ll have the best angle to see the totality. The farther off-angle you are — in other words, the farther north or south of the eclipse’s path — the less of an impact you can expect.

Therefore, if you want to have the best chance of experiencing the eclipse, you’ll want to be in its path. As of this writing, most of the cities in the eclipse’s path have some hotel availability, but recent reports have suggested that rooms are booking up. And as more rooms are booked, prices are going up.

So if you want to be in the eclipse’s path, and need a hotel to do it, move fast. And Delta’s eclipse-viewing flight from Dallas to Detroit has just four seats left at the time of publication.

Eclipse eye safety and photography

As with any solar eclipse, it’s critical you keep eye safety in mind.

During the eclipse, and especially during the periods before and after totality, don’t look directly at the sun without special eye protection. Also, be sure not to look at the sun through a camera (including the camera on your phone), binoculars, a telescope or any other viewing device. This could cause serious eye injury. Sunglasses aren’t enough to protect your eyes from damage.

If you want to view the eclipse, you’ll instead need solar viewing glasses that comply with the ISO 12312-2 safety standard. Anything that doesn’t meet that standard or greater won’t be dark enough to protect your eyes. Want to get them for free? If you’ve got a Warby Parker eyeglasses store nearby, the company is giving away free, ISO-certified solar eclipse glasses at all of its stores from April 1 until the eclipse, while supplies last.

If you don’t have eclipse viewing glasses handy, you can instead use indirect methods for viewing the eclipse, like a pinhole projector.

Read more: A Photographer’s Adventure With the Eclipse

In the event you want to take pictures of the eclipse, attach a certified solar filter to your camera. Doing so will protect your eyes and allow you to take photos while you view the eclipse through your lens.

There’s also a new app to help you both protect your eyes and take better photos of the eclipse on your phone. Solar Snap, designed by a former Hubble Space Telescope astronomer, comes with a Solar Snap camera filter that attaches to the back of an iPhone or Android phone, along with solar eclipse glasses for protecting your eyesight during the event. After you attach the filter to your phone, you can use the free Solar Snap Eclipse app to zoom in on the eclipse, adjust exposure and other camera settings, and ultimately take better shots of the eclipse.

2024 eclipse compared to 2017

The last total solar eclipse occurred in 2017, and many Americans had a great view. Although there are plenty of similarities between the 2017 total solar eclipse and the one coming April 8, there are a handful of differences. Mainly, the 2024 eclipse is going to cover more land and last longer.

The 2017 eclipse started over the northwest US and moved southeast. Additionally, that eclipse’s path was up to 71 miles wide, compared with a maximum width of 122 miles for this year’s eclipse. Perhaps most importantly, the moon completely covered the sun for just 2 minutes, 40 seconds in 2017. This year, maximum totality will last for nearly four-and-a-half minutes.