Testing mobile apps on real devices is essential to ensure a reliable and high-quality user experience. Unlike emulators, real devices provide accurate insights into how an app performs under actual conditions, including varying network environments, battery usage, and hardware interactions. They allow developers to test features like GPS, camera, and sensors, which are difficult to simulate effectively. Additionally, real devices reflect the diversity of screen sizes, operating system versions, and manufacturer customizations, helping identify issues that might only appear in specific configurations. By testing on real devices, developers can better understand how users will interact with the app and ensure it functions smoothly across a wide range of scenarios.
Choosing the right devices is a key factor in mobile app testing, as it ensures smooth performance across a wide range of hardware.
Given the vast array of smartphones and tablets available today, conducting tests on a thoughtfully selected group of devices helps uncover potential compatibility issues early. This approach contributes to building a more stable and trustworthy application.
Key factors for selecting test devices:
Target Audience Analysis
Understanding the target audience is a crucial role when selecting devices for mobile app testing. Consider the following factors when analyzing the target audience:
- Identify the primary age group of users helps refine strategies for user retention and engagement. Millennials and Gen Z tend to favor devices with high-resolution displays and superior performance, while older users often prefer durable and cost-effective options.
- Identify the regions or countries where the application will be released, then analyze the best-common brands in these locations. By continuously tracking trending devices and testing the app on the most widely used models, we can better align with user expectations and strengthen our connection with the intended audience.
Screen Size & Resolution Variability
Mobile app testing must take into account the wide range of screen sizes and resolutions to deliver a consistent user experience across various devices. A thorough testing process should cover commonly used screen configurations to uncover potential layout disruptions, scaling inconsistencies, and other UI-related challenges.
To ensure comprehensive compatibility across devices, mobile app testing should consider the following display-related factors:
- Screen Size Variability: Test across a spectrum of devices, from compact 5-inch smartphones to larger 12-inch tablets, to validate layout adaptability.
- Resolution and Pixel Density (DPI): Account for differences in display quality, including HD, Full HD, and 4K screens, which can impact UI scaling and clarity.
- Market Trends: Leverage up-to-date statistics on the most commonly used screen resolutions in target markets to prioritize device coverage.
- Special Display Features: Address unique screen characteristics such as notches (e.g., iPhone 15), punch-hole cameras, and foldable displays (e.g., Samsung Galaxy Z Fold), which may affect layout rendering and user interaction.
OS Version Coverage
Users do not always upgrade to the latest OS immediately. Therefore, mobile application testing should encompass both current and legacy versions of iOS and Android to identify potential compatibility issues and ensure stable performance across a broader user base.
Ensure that at least one device is upgraded to the latest OS version, and the number of devices running other versions should be based on market share. Note that you cannot downgrade the OS version, so consider carefully before performing an upgrade.
Regularly reviewing the release plans for new OS versions is also essential. It is important to analyze what changes are introduced in the new version and which devices it is compatible with. This information helps define an effective strategy for selecting appropriate test devices.
What are challenges when selecting real device for testing?
- Cost: A large amount of funding is needed to buy or rent multiple devices as expected.
- Handling outdated devices: Over time, some devices are too old and cannot be upgraded to newer OS versions – these devices are rarely chosen by end users in real-world usage. Therefore, continuing to test on these devices is unnecessary and leads the issue of outdated device handling.
- Still need to combine with emulators: In some rare cases, issues are reported on devices that fall outside the list of devices we selected for testing. In such situations, we need to use simulators to reproduce, investigate, and verify the issue.
Conclusion
By applying factors for selecting suitable devices, testing will become more efficient and cost-effective. Create a detailed plan for device selection and consider the actual conditions of your project to decide on the appropriate testing approach.
Some reference links that may be useful to you while doing mobile testing:
- Market share of mobile device/ OS version: https://gs.statcounter.com/vendor-market-share/mobile-tablet-console/worldwide
- Mobile Testing Challenges and BrowserStack Solutions – NashTech Blog
- Upgrade testing in Mobile Application Testing – NashTech Blog
- Accessibility Testing for Mobile Applications – NashTech Blog