If you wish to change the look of your iPhone, this guide shows how to customize iPhone icons to get the look you want.
Alternatively, you could use the official Twitter app’s icon to launch Tweetbot ... and it even allows you to confirm which phone number or email address to use if multiple ones are found in a contact ...
Context menu in File Explorer showing the updated icons for rename and properties. We did some work to help address an issue where sometimes you couldn’t search for an app you’d just installed ...