You can set up voicemail on your Android phone directly from the phone's keypad or its Voicemail app if it features one.

You can change your phone number on WhatsApp whether you're still using the same phone, or you're using a new phone.

Open the Phone app. Tap the menu button at the top and choose Settings from the list of options. Scroll down and select ...

Most people that buy a modern Android phone expect it to work out of the box with minor tinkering. That's also true of various phone features, like reliable connectivity, performance, and storage. But ...