Signia is a huge collection of over 700 vector icons, that are ideal for mobile app design. Each icon is a single shape that can be filled with any color, or easily styled in Photoshop with layer styles. Every icon has been organized and split into categories, so it’s easier to find exactly what you’re looking for.

https://creativemarket.com/Medialoot/487-Signia-700-Vector-App-Icons