Smartphone Hilfe is a free Android app developed by ArbeitnehmerAnwälte. The app is a comprehensive test and optimization tool for smartphones that allows you to diagnose your phone's performance and optimize it accordingly. It provides extensive tests for software, hardware, connections, and battery. It also includes a speed test to measure your internet connection's speed and determine the services you can use.

Moreover, the app's "data transfer" function enables you to transfer contacts, calendars, music, pictures, videos, apps, device settings, and more to your new smartphone or save them as a backup file on a Windows PC and restore them on an Android smartphone. The app also includes interactive instructions for operating and setting up your smartphone. You can ask questions about your smartphone on the connected "Telekom Helps" community to get solutions quickly.

Additionally, you can use the app to create a repair order or query the status of your device. You can also assess and sell your used equipment. The app provides tests for the utilization of the main memory, internal and extended memory, SIM card, mobile network, and internet connection quality.

Overall, Smartphone Hilfe is an excellent app with a user-friendly interface that allows you to optimize your phone's performance and keep it running smoothly.