Android gives you the freedom to use whatever apps and services you want, for the most part. So, for example, if you wanted to use an email app that you prefer over what comes pre-installed, you can ...

Gmail for Android will now use the user’s web-based email signature if no mobile-specific one is set. The new feature supports full formatting, including images and logos, mirroring the desktop ...

You can open Google Hangouts in Gmail to chat with others, but you will need to send an invite if the contact is not yet on Hangouts.