There was a time when thinness was the holy grail of smartphone design. Before megapixels and battery sizes became the new battlegrounds, the world measured innovation in millimeters. Brands like GIONEE, OPPO, and Vivo raced to build the slimmest devices imaginable, producing engineering marvels that looked impossibly elegant—until physics and practicality caught up.
Then came the age of utility. Phones grew thicker to house bigger batteries, better cooling, and increasingly complex camera systems. Design took a backseat to endurance, and the dream of a truly thin yet capable smartphone faded into nostalgia.
Until now.
With the TECNO Spark Slim, that dream quietly returns—reborn through smarter engineering, modern materials, and AI-driven ambition. It doesn’t chase slimness for bragging rights; it treats thinness as a design language. At just 5.93 millimeters, the TECNO SLIM isn’t a throwback to the past—it’s a refined vision of what minimalism looks like in 2025.
First teased at Mobile World Congress, it was the phone everyone wanted to touch—not because it promised record-breaking specs, but because it looked like a concept device that somehow made it to mass production. TECNO positioned it as a statement piece: a device that challenges the industry’s obsession with excess and reminds us that great design is as much about what you remove as what you add.
We got ours a week ago, and instead of arriving in the usual brick-sized box, it came in a sleek white envelope—the kind that could barely fit a nepo baby’s lunch money.
Don’t worry though there’s still a box with all the accessories you need—case, sim tool, wall charger, it even comes with an extra tempered glass.
Design and Build: Elegance Through Absence
At just 5.93 millimeters thin and weighing only 156 grams, the TECNO SLIM feels almost unreal in the hand—so light you’ll instinctively wonder if it’s missing a battery. Stacked beside three twenty-peso coins, it nearly vanishes, yet inside that impossibly slender frame lives a large 5160mAh battery, a 1.5K curved AMOLED display, and a full suite of AI-powered features.
That delicate balance of form and function is made possible by TECNO’s Honeycomb Space Stacking Technology, which meticulously arranges eight major components—from the SIM tray and speaker to the USB-C port and battery—into a space-efficient structure that’s 12% slimmer than conventional builds. The back panel, made from aerospace-grade fiberglass, adds remarkable rigidity without weight, enhancing strength by 300% and toughness by 200%. Combined with military-grade MIL-STD-810H shock resistance, it’s proof that thin can also mean tough.
TECNO calls this feat the “Impossible Triangle”—a phone that’s ultra-slim, durable, and powerful in equal measure—and somehow, it lives up to the name.
Adding to its charm is a feature that gives the device a spark of personality: the Mood Light. Framing the camera module like a pair of glowing eyes, these soft, animated lights respond to your every interaction—pulsing gently while charging, blinking for notifications, and lighting up when “Ella,” TECNO’s built-in AI assistant, comes alive. It’s a whimsical yet sophisticated touch that gives the Slim character, turning it from a piece of tech into something that feels almost sentient. Paired with the minimalist color options—Cool Black and Slim White—the phone exudes a clean, futuristic aesthetic reminiscent of Baymax that lovable companion robot from Big Hero 6.
Display and Audio:
The 6.78-inch AMOLED display is one of the TECNO SLIM highlights. With a 1.5K resolution, 144Hz refresh rate, and up to 4,500 nits peak brightness, the screen is smooth, sharp, and vivid enough for both entertainment and outdoor use. Up front, Corning Gorilla Glass 7i provides extra protection, while the IP64 rating guards against dust and splashes. It’s a rare combination of durability and design flair—features that are often missing from entry-level devices, especially one this thin.
Colors appear rich and well-balanced without oversaturation, and the curved design gives it a near-borderless appearance. The brightness helps when using the phone under direct sunlight, a common challenge when working outdoors. TECNO also adds wet and oily hand touch recognition, allowing the screen to remain responsive even during light rain or with greasy fingertips.
For an entry-level phone, the visual experience is comfortably premium. The high refresh rate makes animations fluid, and the AMOLED panel offers contrast and depth that elevate day-to-day viewing.
The dual stereo speakers with Dolby Atmos support deliver balanced, serviceable sound—clear mids and highs with a hint of bass. Volume levels are sufficient for casual listening, and voice clarity during calls remains crisp.
Performance and Software
Powering the TECNO Slim is the MediaTek Helio G200 processor, paired with 8GB of RAM (expandable to 16GB through memory fusion) and 256GB of storage. The setup isn’t designed for heavy gaming or complex workloads, but it’s more than capable of handling the essentials: messaging, streaming, browsing, and social media multitasking.
In daily use, the interface feels responsive. HiOS 15, based on Android 15, runs smoothly with minimal lag. TECNO’s interface is bright and slightly playful but not overwhelming. There are a few preloaded apps, most of which can be removed.
For gamers, titles like Mobile Legends and Honor of Kings run consistently at 60 to 90fps, with stable performance. The device stays relatively cool during extended sessions, thanks to efficient thermal management. Again this is not a gaming phone so its best for casual games.
TECNO also promises a TÜV-certified five-year fluency guarantee, ensuring that software optimization will maintain performance longevity. It’s an ambitious claim, but it suggests confidence in how the system handles gradual wear over time.
Battery and Charging
The 5160mAh battery is perhaps the TECNO SLIM ‘biggest’ surprise. Thin phones have often sacrificed battery life, but TECNO managed to fit a respectable cell that comfortably lasts through a full day of mixed use. With moderate usage—social media, calls, video, and light gaming—it can even stretch into a second day.
Charging is handled by 45W Super Charge, which can bring the battery to full in under an hour. The phone also supports Bypass Charging, a feature that powers the system directly when plugged in to reduce heat and battery strain.
TECNO claims the battery retains most of its capacity after five years of regular use, and while long-term testing will confirm that, early results look promising. There’s also 10W reverse charging, allowing the Slim to act as a power source for smaller devices like earbuds in emergencies.
Mid Camera for Socials
The TECNO Slim features a 50MP main camera and a 13MP front camera, both tuned for casual and social media-friendly photography. Under good lighting, images are detailed with decent color accuracy and contrast. HDR performs well, maintaining balance in bright or shadowy scenes.
In low light, the photos rely more heavily on AI algorithms, which smooth out noise at the cost of fine detail. Still, they’re perfectly usable for sharing online. The AI Eraser 2.0 and Image Extender tools add editing flexibility, letting you remove distractions or expand backgrounds with ease.
The Universal Skin Tone algorithm deserves credit—it helps portraits look more natural across various complexions, avoiding the overly bright or washed-out effect that budget cameras often produce.
Video recording supports 2K at 30fps and 1080p at 60fps, which is reasonable for its segment. Stabilization is electronic and good enough for handheld shots, though motion-heavy clips can look slightly jittery.
One fun mode is AIGC Portrait which allows you to choose from several presets and create your personalized avatars
Everyday Experience
In everyday use, the TECNO Slim stands out for its lightness and comfort. It’s easy to handle with one hand, fits comfortably in pockets or small bags, and doesn’t overheat or lag during typical tasks. The curved edges help it feel natural in the palm, while the AMOLED screen gives it a sense of visual luxury uncommon in its price bracket.
FINAL WORD
The TECNO SLIM revisits a forgotten ambition in smartphone design—thinness that doesn’t compromise practicality. It’s not here to outperform midrange flagships in benchmarks or camera innovation, but to reintroduce a form factor that once defined elegance in technology.
It delivers solid battery life, reliable day-to-day performance, a quality display, and a sturdy build, all in a frame barely thicker than a stack of coins. It’s the kind of phone that makes you appreciate simplicity again.
If you’re looking for a dependable daily driver that feels premium without being expensive, theTECNO SLIM fits the brief. It’s not revolutionary, but it’s refreshingly different.
Pricing and Availability
The TECNO Slim (Spark Slim 4G) is officially priced at ₱9,499 in the Philippines. From October 8 to 10, early buyers can grab it for ₱7,999 on Shopee and TikTok, or for as low as ₱7,599 in select TECNO stores via SPayLater with 0% interest options through Home Credit, Skyro, and Kredivo.
Each purchase also comes with a TECNO x TM x Honor of Kings SIM card, preloaded with exclusive data perks for gamers and streamers. Available in Slim White and Cool Black, the TECNO Slim officially goes on sale nationwide starting October 8, 2025—just in time for the holiday shopping season.
