Explanation
Sandbox testing is a method of testing changes in a simulated environment that mimics the real one, without affecting the actual production system. Sandbox testing is useful for change management because it allows the testers to evaluate the change before deployment, and ensure that it works as intended, does not cause any errors or conflicts, and meets the requirements and expectations of the stakeholders. Sandbox testing also helps to protect the investment in the existing system, as it reduces the risk of introducing bugs or breaking functionality that could harm the customer experience or the business operations. Sandbox testing also gives the testers more control over the customer experience, as they can experiment with different scenarios and configurations, and optimize the change for the best possible outcome.
References:
1: Change Management and Sandbox - Quickbase1 2: Embracing change: Build, test, and adapt in a sandbox environment - Zendesk3

The best way to address the security and privacy concerns caused by a malware infection on a smartphone is to uninstall all recently installed applications and schedule an antivirus scan. Uninstalling the applications that may have introduced the malware can help remove the source of infection and prevent further damage.
Scheduling an antivirus scan can help detect and remove any remaining traces of malware and restore the device's functionality.
References: CompTIA A+ Core 2 (220-1102) Certification Study Guide, Chapter 5: Mobile Devices, Section
5.3: Mobile Device Security1

The best way to resolve the issue is to move factory applications to external memory. This will free up some space on the phone's internal storage, which is required for updating the phone. To do this, you can follow these steps1:
* Insert a microSD card into your phone if you don't have one already.
* Go to Settings > Apps and tap on the app you want to move.
* Tap on Storage and then on Change.
* Select the SD card option and tap on Move.
You may need to repeat this process for multiple apps until you have enough space to update your phone.
Alternatively, you can also clear the cache and data of some apps, or uninstall the apps that you don't use frequently. You can find more information on how to fix insufficient storage error on your phone in these articles234. I hope this helps.

Explanation
change management process can help ensure that owners are notified of changes being made and can monitor them for performance impact (A). This can help prevent unexpected issues from arising.