For the most part, React Native’s Image component handles image caching in the same way as browsers do. If the server is returning proper cache-control headers for images you’ll generally get the sort of built-in caching behavior you’d have in a browser. Even so many Read more…
To get phone contacts in the react-native application, it provides a package called react-native-contacts. This package provides you with all the contacts and their info from your mobile device.
npm install react-native-contacts –save
cd ios && pod install