Slim Phones Revolution: Tecno Spark Slim vs Samsung S25 Edge Face-Off

By: Ahmed RazaRead time: 7 min
Slim Phones Revolution: Tecno Spark Slim vs Samsung S25 Edge Face-Off

Slim Phones Revolution: Tecno Spark Slim vs Samsung S25 Edge

Introduction: The Rise of Ultra-Thin Phones in 2025

The 2025 smartphone arena is dominated by a race toward razor-thin profiles. Fueled by MWC showcases, brands like Tecno and Samsung are pushing boundaries with sub-6mm designs. The Tecno Spark Slim (5.75mm) and Samsung Galaxy S25 Edge (5.8mm) lead this charge, promising flagship specs without the bulk. But do they sacrifice durability, battery life, or usability for slimness? Let’s dissect the revolution .

Ultra-thin smartphones displayed at MWC 2025

Tecno Spark Slim vs Samsung S25 Edge: Design Showdown

Tecno Spark Slim and Samsung S25 Edge side-by-side

Tecno Spark Slim

  • Thickness: 5.75mm, making it the world’s thinnest phone (excluding foldables) .
  • Weight: 166g with a plastic back and dual-curved edges for grip .
  • Aesthetics: Features a striking camera bar with LED rings and a 6.78" 144Hz AMOLED display .

Samsung S25 Edge

  • Thickness: 5.8mm, with a titanium frame and Gorilla Glass Ceramic 2/Victus 2 .
  • Weight: 163g, leveraging premium materials for rigidity .
  • Aesthetics: A minimalist 6.7" LTPO AMOLED with 120Hz refresh rate and IP68 rating .

Verdict: Tecno wins on thinness; Samsung on material luxury.

How Thin Is Too Thin? Durability Concerns Addressed

Durability comparison between titanium and plastic frames

Ultra-slim designs spark fears of bending or fragility. Here’s how these phones cope:

  • S25 Edge: Titanium frame and IP68 rating offer proven resilience. Repair technicians note its layered glass-titanium-glass sandwich distributes stress better than all-plastic builds .
  • Spark Slim: Relies on plastic and curved edges for flexibility. Though Tecno claims reinforced internals, the absence of IP ratings or rigid metals raises concerns about long-term survival .
  • Expert Take: Phone repair shops report titanium-framed devices (like Samsung’s) survive 3× more drops than slim plastic models under stress tests .

Battery Life in Slim Frames: Any Compromise?

Silicon-carbon battery technology in slim phones

Tecno’s Engineering Feat

  • Packs a 5,200mAh silicon-carbon battery into 5.75mm—a first for slim phones. Supports 45W charging .
  • Early MWC demo units showed "all-day usage," though real-world gaming/streaming tests are pending .

S25 Edge’s Efficiency Play

  • Smaller 3,900mAh battery but optimized for Snapdragon 8 Elite’s 3nm efficiency. Lasts 11.93 hours in GSMArena’s endurance test .
  • Supports 25W wired and 15W wireless charging.

Stress Test Insights:

Scenario Spark Slim (Est.) S25 Edge (Tested)
Gaming (PUBG) ~8 hours 8 hours
Video Streaming ~16 hours 13 hours
Standby ~7 days 5 days

Tecno’s larger capacity should win, but Samsung’s chipset efficiency levels the field.

Specs & Pricing: Budget Spark Slim vs Premium S25 Edge

Feature Tecno Spark Slim Samsung S25 Edge
Display 6.78" AMOLED, 144Hz, 4,500 nits 6.7" AMOLED 2X, 120Hz, 2,600 nits
Chipset Unnamed octa-core (mid-range suspected) Snapdragon 8 Elite
Camera Dual 50MP + 13MP front 200MP main + 12MP ultra-wide
Storage/RAM Unspecified 12GB RAM + 256GB/512GB
Price Unreleased (estimated ~PKR 80,000) $919 / ₹1,09,999 / PKR 285,000
Tecno Spark Slim and Samsung S25 Edge color options

Positioning:

  • Spark Slim: Targets budget-conscious buyers (similar to Tecno SPARK 30 Pro at PKR 35,100 ).
  • S25 Edge: Premium segment rivaling iPhone 17 Air rumors .

Verdict: Which Slim Phone Wins in 2025?

  • For Tech Daredevils: The Tecno Spark Slim is a bold concept with a revolutionary battery. If launched near its estimated price (under PKR 80,000), it’ll dominate the budget slim phone market .
  • For Practical Flagship Users: The S25 Edge delivers a polished ultra-thin experience with top-tier performance, cameras, and durability. Worth the premium if you prioritize real-world reliability .
Comparison of Tecno Spark Slim and Samsung S25 Edge in daily use

The Bigger Picture: Tecno proves slim phones can house big batteries—pressuring Samsung to innovate beyond aesthetics.

FAQs About Slim Phones in 2025

  1. Which is the thinnest phone in 2025?
    Tecno Spark Slim (5.75mm), beating Samsung S25 Edge (5.8mm) and rumored iPhone 17 Air (5.44mm sans camera bump) .
  2. Is Tecno Spark Slim available in Pakistan?
    Not yet. It’s a concept with no confirmed launch date. Competing slim phones like vivo V30 (7.45mm/5,000mAh) sell at PKR 99,176 .
  3. Do slim phones overheat?
    The S25 Edge uses a vapor chamber for cooling. Tecno’s Slim lacks details, but thin frames can limit heat dissipation—observed in stress tests .
  4. Can a 5.75mm phone bend easily?
    Samsung’s titanium frame resists bending. Plastic-bodied phones (like Spark Slim) risk flexing but benefit from curved ergonomics .

Meta Description:
Tecno Spark Slim (5.75mm) vs Samsung S25 Edge (5.8mm): We compare battery life, durability, and specs of 2025's thinnest phones. Can slim designs survive real life?

Explore Samsung’s official S25 Edge page [here] or Tecno’s MWC 2025 showcase [here]. For more slim phone reviews, see our vivo V30 deep dive [here].