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| | Variable | Definition |
|
| Input | Price | The product purchase price. The buyer owns the product after purchase, and the ownership is transferred from the seller to the buyer |
|
| Output | Ease of use (Q1) | How easy is it is to access the phone’s various features and modes |
| Messaging (Q2) | Assessing keyboard ergonomics, e-mail readability, attachment capabilities, and text-messaging features |
| Web browsing (Q3) | Assess browser capabilities |
| Display quality (Q4) | Representing overall picture quality, including pixel resolution, contrast under normal and bright lighting (outdoor use) conditions, and color accuracy |
| Voice quality (Q5) | Incorporating listening and talking in noisy and quiet settings while on a phone call |
| Phoning (Q6) | Considering the step-saving functions for making and receiving calls, including hands-free capabilities such as voice command and Bluetooth, speed dialing, ringer controls, call timers, and more. We also evaluated keypad readability under different lighting conditions |
| Battery life (Q7) | Representing tests under nominal cell-network signals, including battery consumption while performing tasks that involve voice, data, display, and other factors |
| Camera image quality (Q8) | Evaluating resolution, dynamic range, color accuracy, and visual noise |
| Camera video quality (Q9) | Judging recorded video images shot at the highest quality setting available |
| Portability (Q10) | Representing our judgment based on the ideal combination of size and weight |
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