Foldable smartphones have moved from experimental devices to mainstream products. This beginner’s guide explains everything you need to know before buying your first foldable phone.

What Are Foldable Smartphones?

Foldable smartphones use flexible display technology to create devices that can transform between phone and tablet sizes. The two main form factors are book-style foldables that open like a book to reveal a larger inner display (like Samsung Galaxy Z Fold series) and clamshell foldables that fold vertically into a compact square (like Samsung Galaxy Z Flip series).

The technology relies on ultra-thin glass (UTG) covered by a protective polymer layer, allowing the display to bend repeatedly without damage. Modern foldables are rated for 200,000 folds or more—equivalent to folding and unfolding 100 times per day for over 5 years.

Pros of Foldable Smartphones

The primary advantage is a larger screen in a portable form factor. Book-style foldables offer 7.6-inch tablet displays that fit in your pocket. This is ideal for reading documents, watching videos, multitasking with split-screen apps, and using creative tools like drawing apps.

Clamshell foldables offer superior portability—they fold into a compact size that fits easily in small pockets or bags. They also function as a stand for hands-free video calls when partially folded.

Cons of Foldable Smartphones

Foldables have several drawbacks compared to traditional smartphones. The crease where the display folds remains visible, though it has become less prominent with each generation. The flexible display is more fragile than standard glass and susceptible to damage from sharp objects or pressure.

Price is another major consideration. Foldables cost significantly more than traditional flagships—typically 200,000-300,000 yen compared to 150,000-200,000 yen for standard flagships. Battery life can also be shorter due to the power-hungry large display.

Summary

Foldable smartphones offer unique advantages in screen size and portability, but they come with trade-offs in durability and price. Consider your priorities before deciding whether a foldable is right for you.