If I were to choose the best phone number app for Android, then I would have to pick Google Voice. All of its functions will help you with your business ventures. It gives you a chance to communicate well with your associates and customers without giving out personal information that you wish to keep private. All of the extra features it gives made this the best phone number app. And the best part about this app is it's free. But, in the end, you are the one that's going to choose which phone number app is the best for you. If you prioritize a different feature, then you might not like Google Voice. So it's better to check out all the apps that are included on this list to know which one is most suitable for you.