Samsung Galaxy Z Flip 4 review: iterative upgrade with excellent performance, better but not great battery, and useful cover screen but hard to use one-handed
Foldable smartphones still feel like a brand new idea, but in reality, Samsung is now on its fourth generation of the form factor.
Context & Ripple Effects
This review lands one year after The Verge flagged the Flip 3's too-small cover screen and unknown durability, and nine days after Engadget's Flip 4 hands-on called it an incremental but nice upgrade. Read against that arc, the verdict is consistent: Samsung is fixing last generation's complaints one at a time — the front display grows to 1.9 inches, performance improves — while the same two weaknesses (battery and one-handed use) carry over.
What makes the fourth-generation framing matter is that the complaints are now trackable across reviews rather than novel: the battery that is 'better but not great' here reappears as 'so-so' in the Flip 5 review a year later, and the durability question left open since the Flip 3 eventually gets answered with IPX8 and multi-year update commitments.
First-order effects
- Flip 3 owners weighing this year's model get a clearer trade than usual: a bigger 1.9-inch cover screen and stronger performance, but no fix for the one-handed ergonomics reviewers have flagged two generations running.
- Samsung's annual cadence means the Fold 4, whose hands-on the same week praised easier one-handed use and more durable displays, absorbs the engineering attention the Flip line defers — the two foldable lines are diverging in what they optimize.
Second-order effects
- Each unresolved complaint becomes the spec sheet for the next launch cycle: the cover screen went from 'too small' (Flip 3) to 'useful' (Flip 4) to widget-capable (Flip 5), so reviewers and buyers now judge Samsung on whether it closes the battery gap next, not on the form factor itself.
- As Samsung's foldables mature into predictable yearly refinements, they become the baseline rival foldables are measured against — the corpus shows Google's Pixel fold line positioned explicitly against Samsung's latest Fold generations.
Third-order effects
- If the pattern holds, flip-style foldables complete the transition the corpus traces from novelty (unknown durability in 2021) to mainstream long-lived hardware (seven-year update commitments by 2024), shifting competition from 'does folding work' to battery life, software support length, and price.
- The durability question that every early review left open gets settled not by any single teardown but by warranty-length escalation — support windows become the durable differentiator once the hardware itself stops changing much year to year.
The trend: Samsung is iterating flip-style foldables into a mature annual product line, with each generation retiring one prior review complaint while battery life and ergonomics remain the persistent open fronts.