Why Apple and Samsung Are Obsessed With Thin Phones

Apple and Samsung push thinness because it drives premium perception, enables larger batteries and cameras within the same pocket footprint, and creates a measurable spec that marketing can tout. The obsession isn’t just about looks—it’s a competitive feedback loop where each generation must be thinner than the last, even when the practical benefits are minimal. This article explains the engineering, marketing, and consumer psychology behind the thin-phone race, plus the real trade-offs you should know before upgrading.

The Race to the Slim

The modern smartphone thickness benchmark started with Apple’s 2012 iPhone 5 (7.6 mm) and Samsung’s 2014 Galaxy Alpha (6.7 mm). Since then, both companies have hovered around 7–8 mm, with occasional dips below 7 mm for flagship models like the Galaxy S6 (6.8 mm) and iPhone 6 (6.9 mm). In 2024, the iPhone 15 Pro sits at 8.25 mm, and the Galaxy S24 Ultra at 8.6 mm—thicker than a decade ago, but still far slimmer than the 12–15 mm of early smartphones. The recent push toward foldables has rekindled the race: the Galaxy Z Fold 6 folds to 12.1 mm, and Apple is rumored to be working on a foldable that could be under 10 mm when closed.

Why does a millimeter matter? Because it’s the easiest spec to compare. Consumers can’t feel a faster chip, but they can feel a thin phone in their hand and see it in photos. A thinner profile also signals engineering prowess—it implies the company has managed to shrink components, improve thermal management, and still fit a large battery. That halo effect boosts the entire brand, not just the specific model.

Engineering Trade-Offs

Making a phone thinner forces engineers to make hard choices. The three biggest constraints are battery capacity, camera module height, and structural rigidity.

• Battery: A 1 mm reduction in thickness can cost 300–500 mAh of capacity, which translates to hours of usage. To compensate, companies use higher-density cells or more efficient chips, but there’s a physical limit.
• Camera: Larger sensors and optical zoom lenses need vertical space. The camera bump on many flagships is now 2–3 mm, which means the phone is thin only in the middle. Some manufacturers have moved to periscope lenses that lay the sensor flat, but that still requires internal depth.
• Rigidity: A thinner aluminum or glass shell bends more easily. To avoid the “bendgate” controversy that hit the iPhone 6, Apple and Samsung use stronger alloys, internal titanium frames, and more adhesive—all of which add weight and cost.

These trade-offs explain why the thinnest phones often have smaller batteries or fewer camera features. For example, the 6.9 mm iPhone 6 had a 1,810 mAh battery, while the thicker 8.25 mm iPhone 15 Pro packs 3,274 mAh. The camera bump is a visual compromise: the phone is thin where it doesn’t need to be, and thick where the lens protrudes.

Marketing and Consumer Psychology

Thinness is a proxy for innovation. When a company releases a thinner phone, it sends a message that the device is more advanced, more premium, and more desirable. This is why marketing materials always highlight the thickness in millimeters, often with a side-profile shot that makes the phone look impossibly slim. The psychological effect is real: a thinner phone feels lighter and more elegant, even if the actual weight difference is only 10–20 grams.

There’s also a competitive arms race. When one company releases a thinner flagship, the other must respond to avoid appearing outdated. This is especially true in the premium segment, where specs are heavily compared in reviews. A 0.5 mm difference can become a headline, even if users can’t perceive it without a caliper.

How Thin Is Too Thin?

There are practical limits to thinness. The current constraint is the USB-C port (2.5 mm tall) and the SIM tray (1.2 mm), but the real limit is battery life. A phone that is 5 mm thick would have a battery so small that it would need charging multiple times a day, which consumers would reject. That’s why most flagships hover between 7 and 8.5 mm—it’s the sweet spot where the phone feels thin but still lasts a day.

Another limit is durability. The iPhone 6’s bendgate incident showed that too-thin aluminum can deform under pressure. Since then, companies have reinforced frames with titanium or stainless steel, but that adds weight. The Galaxy S24 Ultra is 8.6 mm thick and weighs 232 grams, which is heavier than the 6.9 mm iPhone 6 (129 grams). Consumers now accept a thicker, heavier phone if it means a bigger battery and a sturdier build.

Common Problems With Thin Phones

Thin phones come with real-world issues that owners notice:

• Camera bump wobble: When placed on a flat surface, the phone rocks because the camera protrudes. This is a daily annoyance for many users.
• Reduced battery life: Thin phones often have smaller batteries, so you may need to charge mid-day. This is a common complaint with ultra-thin models.
• Overheating: Less internal space means less room for heat dissipation. Thin phones can throttle performance during gaming or video recording.
• Easier to drop: A thinner profile can be more slippery, especially with glass backs. Many users add a case, which negates the thinness advantage.

These issues are why some manufacturers have moved away from extreme thinness. Samsung’s Galaxy S24 Ultra is actually thicker than its predecessor, and Apple’s Pro models have grown slightly thicker to accommodate better cameras and batteries.

Alternatives to Thinness

Instead of chasing thinness, some manufacturers focus on other metrics:

• Battery capacity: Phones like the Asus ROG Phone series are 10 mm thick but offer 6,000 mAh batteries, lasting two days.
• Camera quality: The Google Pixel series prioritizes computational photography over thinness, with a prominent camera bar that houses multiple sensors.
• Durability: Rugged phones like the Samsung Galaxy XCover Pro are thicker but meet military drop standards.
• Foldables: These devices are thicker when folded (12–15 mm) but offer a larger screen when open, which is a different kind of innovation.

These alternatives show that thinness isn’t the only path to premium. However, for Apple and Samsung, thinness remains a key part of their brand identity, so they will likely continue to push the envelope—but with more caution than in the past.

Frequently Asked Questions

Why are phones getting thicker again?

After the ultra-thin era of 2014–2016, flagship phones have actually gotten thicker. The reasons are bigger batteries, larger camera sensors, and 5G antennas that require more internal space. The iPhone 15 Pro is 8.25 mm thick, which is thicker than the 6.9 mm iPhone 6, but it offers dramatically better battery life and camera quality.

Does a thinner phone mean worse battery life?

Not necessarily. Thinner phones often have smaller batteries, but they may also use more efficient processors or larger batteries with higher energy density. For example, the 7.6 mm iPhone 13 has a 3,227 mAh battery, while the 8.25 mm iPhone 15 Pro has 3,274 mAh—only a small difference despite the thickness increase. However, as a rule, a thinner phone of the same generation will have a smaller battery than a thicker one.

Why do thin phones have camera bumps?

Camera sensors and lenses need a certain amount of physical depth to focus light. A phone that is 7 mm thick cannot fit a 10 mm camera module, so the camera protrudes. This is why many thin phones have a visible bump. Some manufacturers have tried to minimize the bump by using smaller sensors or periscope lenses, but there’s always a trade-off with image quality.

Is a thin phone more likely to bend?

Yes, thinner phones are generally less rigid, especially if they use aluminum or glass. The iPhone 6 bendgate incident was a famous example. Modern phones use stronger materials like titanium or stainless steel frames, which resist bending, but they are still more fragile than thicker models. Using a case can help protect against bending and drops.

What is the thinnest phone ever made?

The thinnest production smartphone is the 2014 Vivo X5 Max, which measured just 4.75 mm thick. However, it had a small battery and a modest camera. Apple’s thinnest phone is the iPhone 6 at 6.9 mm, and Samsung’s thinnest is the Galaxy A8 at 5.9 mm. These ultra-thin models often sacrifice battery life and durability.

Will foldable phones replace thin phones?

Foldables offer a different value proposition: a larger screen in a pocketable form. They are thicker when folded, but the unfolded screen makes them feel more versatile. Apple and Samsung are both investing heavily in foldables, but they haven’t abandoned thinness for traditional slab phones. The two form factors will likely coexist for the foreseeable future.

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