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Ultra-Slim Smartphones Take Over in 2025 with Tecno SPARK Slim Leading the Trend

2025 is well on its way to being the year of thin smartphones. From the launch of the OPPO Find N5, the planned release of Samsung Galaxy S25 Edge, to rumors about Apple's thinnest iPhone model yet, the iPhone 17 Air, mobile phone manufacturers are competing to increase thinness with performance. To add to the hype, Tecno has also unveiled its SPARK Slim concept phone, which will be exhibited at MWC 2025. This article explores in depth the trend of ultra-thin smartphones and looks at how Tecno's new concept phone measures up to others.

Tecno SPARK Slim

The Rise of Ultra-Slim Smartphones

Big brands have been capturing headlines in recent months with their own slim offerings. OPPO came big with the Find N5, which is now the world's thinnest foldable smartphone, raising the bars for foldable technology. Samsung is close behind with its Galaxy S25 Edge, which promises to be one of the thinnest flagship devices from the company ever. While this is happening, Apple is said to be developing its thinnest device to date—the iPhone 17 Air, which is expected to be just 5.5mm thin. Not wanting to be left behind, Tecno has jumped into the fray with the SPARK Slim Concept, which is set to revolutionize thinness in smartphone design. This indicates that top technology giants and upstart brands alike are concentrating on ultra-thin designs, which makes 2025 the year when slim smartphones become the spotlight.


Tecno SPARK Slim Concept

Tecno’s latest concept phone, the SPARK Slim, has already generated buzz ahead of its showcase at MWC 2025. Here’s a detailed look at its key features:

Tecno SPARK Slim

Ultra-Slim Design

The Tecno SPARK Slim design is said to have a remarkably thin 5.75mm profile. To put that into perspective, the so-called iPhone 17 Air is said to be slightly thinner at 5.5mm. Official Tecno images highlight the phone's slender frame, comparing it to a pencil in terms of thinness.



High-Resolution Display

The SPARK Slim features a 6.78-inch 3D curved AMOLED screen with a 1.5K resolution. It offers support for up to a 144Hz refresh rate for enhanced visuals and comes with a staggering 4,500 nits peak brightness, guaranteeing great visibility even in light environments.


Powerful Camera System

Tecno has loaded the SPARK Slim with a dual 50MP rear camera module, contained within a protruding horizontal camera bar that looks like Google's Pixel 9 series. The front is equipped with a 13MP selfie camera, which makes it a great device for photography and video calls.


Massive Battery in a Slim Frame

One of the most difficult aspects of producing ultra-slim phones is accommodating a big battery without adding thickness. Tecno has been able to fit a 5,200mAh battery into the device despite its 5.75mm thickness. The battery itself is only 4.04mm thick and charges at 45W fast wired charging, meaning top-ups will be fast.


Premium Build Quality

The SPARK Slim is built using recycled aluminum and a stainless steel unibody, making it not just sleek but also environmentally friendly and durable.


High-Performance Processor

While Tecno hasn’t revealed the exact chipset powering the SPARK Slim, the company has confirmed that it features a high-end octa-core processor, ensuring smooth performance across various tasks.


How Does the SPARK Slim Compare to Other Ultra-Thin Smartphones?

Apple iPhone 17 Air vs. Tecno SPARK Slim

  1. Thickness: iPhone 17 Air (5.5mm) vs. SPARK Slim (5.75mm)

  2. Display: iPhone expected to feature an OLED display, SPARK Slim offers 1.5K AMOLED with 144Hz refresh rate

  3. Battery: iPhone battery size unknown, SPARK Slim packs 5,200mAh

  4. Camera: iPhone is rumored to feature an advanced dual or triple-lens system, SPARK Slim has 50MP dual cameras


OPPO Find N5 vs. Tecno SPARK Slim

  1. Form Factor: OPPO Find N5 is a foldable device, while SPARK Slim is a conventional smartphone

  2. Thickness: OPPO’s exact thickness is unknown, but Tecno claims its SPARK Slim is one of the thinnest in the industry

  3. Battery: OPPO’s battery may be smaller due to foldable constraints, SPARK Slim offers 5,200mAh


Samsung Galaxy S25 Edge vs. Tecno SPARK Slim

  1. Samsung’s Galaxy S25 Edge is expected to be a sleek, curved-edge device, while Tecno’s SPARK Slim is purely focused on being the thinnest phone in its category.


Will the Tecno SPARK Slim Be Available for Purchase?

Although the Tecno SPARK Slim is an innovative idea, as of now it is only an exhibition model. Tecno made no official word on its possible commercial launch. If the smartphone does go on the production floor, it can become a standard for thin phones in the industry.


The Future of Ultra-Thin Smartphones

The growing need for thin smartphones shows that companies are focusing on portability without sacrificing performance. Advances in battery technology, cooling systems, and material science will keep driving the boundaries of thinness in smartphones. Tecno's SPARK Slim concept is evidence that even mid-range companies are following this trend.


In the future, we can anticipate more brands competing to produce the slimmest smartphones in the world, providing consumers with premium looks without compromising on key features.



The Tecno SPARK Slim idea is a bold foray into the realm of ultra-thin smartphones. With an ultra-thin profile, long-lasting battery, premium display, and robust cameras, it can be a game-changer. Though its release is still in question, it certainly contributes to the emerging trend of ultra-thin smartphones in 2025. As a tech enthusiast or a person who likes stylish and thin devices, this is something you should watch out for.

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