Enable the New Salesforce Mobile App (Critical Update)
Where: This change applies to the new Salesforce mobile app for iOS and Android in all editions, except Database.com.
Why: With this update, all active Salesforce mobile app users, including both Salesforce Classic and Lightning Experience users, will be upgraded to the new Salesforce mobile app. Users don’t need to download a new version of the Salesforce mobile app for iOS or the Salesforce mobile app for Android to get the new experience.
How: To get ready for the transition, we recommend that you use the tools on the New Salesforce Mobile App QuickStart page in Setup. Run the Salesforce Optimizer for Mobile Lightning Pages Report (Beta) to see how your custom Lightning pages will be affected by the transition, and get recommendations to fine-tune the mobile experience. Then use our tools to update your Lightning apps and pages for mobile.