Smartphone touchpad concept tries to solve one of the biggest problems with big phones - Yanko Design
Briefly

The Poinf design concept aims to offer greater control on large smartphones by providing a touchpad on the back, allowing users to comfortably use their devices with one hand.
Using a 'Magic Mouse' style interface could bridge the gap in usability, making it easier to navigate large screens without the need for cumbersome one-handed modes.
The irony lies in our reliance on the traditional mouse as a means to interact with screens, leading to the question of whether similar concepts could enhance touch-screen devices.
With Poinf, the index finger on the back of the phone can be used more effectively, addressing the primary issue of accessibility on large-screen smartphones.
Read at Yanko Design - Modern Industrial Design News
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