Modern hearing aids can connect to a great many devices. In particular Smart mobile phones offer a great deal of control and flexibilty to make adjustments and alterations to your hearing aids.
Note that connections to Android phones sometimes offer fewer functions and are generally less reliable or stable than connections to Apple phones. In most cases it is the phone, not the App that is the issue.
Below are links to videos showing how to perform basic tasks to keep your hearing aids working properly
click on the image to link to a series of videos to help you complete the task you are trying to perform.
The videos are grouped in categories and so cover multiple makes. Instructions for one make will often work perfectly on another, so don't worry if your specific hearing system is not mentioned by name.