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In the last year, we’ve seen a surprising new trend in the mobile industry - the rise of the Slim Edition smartphone. Ultra-thin phone concepts are being teased at major events, new prototypes are appearing on social media, and brands are already competing for the title of “world’s slimmest smartphone”. But why now? And what’s driving this sudden interest?
The quick verdict
Phones are going slim because shrinking batteries, chips and boards make thinner, lighter, more portable designs possible, and because brands follow each other's trends. Apple and Samsung are reported to be working on slim flagships. Thin phones are appealing, but if durability, cooling and repairability matter to you, wait to see how the first slim models handle those concerns.
Slim smartphones at a glance
| Point | What we know |
|---|---|
| Headline concept | Tecno Spark Slim, shown at WMC 2025 |
| Tecno Spark Slim specs | 5.75mm thick, two 50MP cameras, 5200mAh battery |
| Rumoured slim flagships | iPhone 17 Air and Samsung Galaxy S25 Edge |
| Why now | Smaller components, portability and industry trends |
| Concerns | Overheating, bending risk and reduced repairability |
The Tecno Spark Slim is still a concept and the slim flagships are rumoured.
Let’s take a look at the slim smartphone trend and what it could mean for the future of mobile tech.
If you’re curious about what new features might also be coming, check out our Features We’d Love To See In a Smartphone guide.
What Is the Tecno Spark Slim Phone?
At the World Mobile Congress 2025, Chinese manufacturer Tecno unveiled an early prototype called the Tecno Spark Slim. Positioned as the “world’s slimmest smartphone”, it measures just 5.75mm thick - thinner than many older iPods - yet still manages to pack in two 50MP cameras and a 5200mAh battery.
Before this, the slimmest flagship-style devices came from foldable categories such as the Oppo Find N5, Google Pixel 9 Pro Fold and Samsung Galaxy Z Flip 6. But the Tecno Spark Slim is different - a traditional slab-style smartphone with near-impossible thinness.
It’s still only a concept for now, but its strong reception at WMC 2025 has made it one of the most talked-about prototypes of the year.
Are Phones Actually Getting Thinner?
It certainly looks that way. Reports suggest both Apple and Samsung are working on slim editions of their future flagships - rumoured as the iPhone 17 Air and Samsung Galaxy S25 Edge. With prototypes already circulating online, it seems the “slim era” is beginning to take shape.
So why are smartphone brands pushing for thinner designs? We think it comes down to two main reasons: practicality and trend-driven innovation.
1. Practicality
A thinner phone is naturally lighter and more portable. It slips easily into pockets, bags and small compartments, making it ideal for users who want a powerful device without the bulk. As component sizes shrink - especially batteries, chips and internal boards - slim designs have become far more achievable.
2. Trending Technology
The smartphone industry is highly competitive, and when one brand hints at a slim edition, others tend to follow. Smaller internal components also mean slimmer phones can be produced more affordably, which gives brands room to introduce new price tiers.
And, of course, tech trends shape consumer demand. If “thin phones” becomes the next big aesthetic, manufacturers will race to latch onto it.
For more innovation talk, see our breakdown of What Is The Nothing Phone?.
Is Slimming Tech Really a Good Idea?
While slim smartphones bring exciting design possibilities, they also raise questions. Ultra-thin frames can mean less internal support, smaller cooling systems and potentially reduced durability. Overheating, bending risks and reduced repairability are all concerns that will need addressing as slim models move closer to release.
It’s an interesting trend to watch - and one we’ll be keeping an eye on as brands push for thinner, lighter designs across their flagship line-ups.
If you’re curious about trying new models (slim or not), browse our refurbished smartphone collection for top-rated devices at lower prices.
Frequently asked questions
What is the Tecno Spark Slim?
The Tecno Spark Slim is an early prototype unveiled by Tecno at WMC 2025 as the world's slimmest smartphone. It measures 5.75mm thick yet packs two 50MP cameras and a 5200mAh battery, but it is still only a concept.
Are Apple and Samsung making slim phones?
Reports suggest both Apple and Samsung are working on slim editions of future flagships, rumoured as the iPhone 17 Air and the Samsung Galaxy S25 Edge, with prototypes already circulating online.
Why are smartphones getting thinner?
Thinner phones are lighter and more portable, and shrinking batteries, chips and internal boards make slim designs more achievable. The industry is also competitive, so when one brand hints at a slim edition, others tend to follow.
Are slim phones less durable?
Ultra-thin frames can mean less internal support, smaller cooling systems and potentially reduced durability. Overheating, bending risks and reduced repairability are concerns that slim phones will need to address.
