Track Mobile Logins from Salesforce for Android and iOS App

Below are some alternatives you can use to track the mobile logins of the users in your org:

Identity User Report

• It's Best Practice to create a custom report type between Users and Identity Event Logs to show Salesforce branded mobile Apps usage.
• See also: Create an Identity Users Report
• This custom report type can not be created on Professional Edition orgs as they do not have access to the Identity Event Logs (Users) object.
• This report does not include OS Version on the users' devices. If you need this information and use Mobile Device Management (MDM), you can leverage that to determine the Users' OS version. If you don't use MDM, you will need to ask your users.

User's Login History

• Login History entries can show when an Application was connected in the last six months.
• End Users can see their own Login History, and System Administrators can view all Users' History.
• See also: Monitor Login History

User's Oauth Connected Apps list

• This can be found on the individual user record, under the 'OAuth Connected Apps' related list.
• End Users can see their own Oauth Connected Apps list, and System Administrators can view all Users' lists.
• See also: Manage OAuth Access for Your Connected Apps

Connected Apps Oauth Usage list

• To find this list in Setup, please see Manage Current OAuth Connected App Sessions
• The section about about "user count" describes information about App Users