Turn Off Mobile Application Access

You can control what modules are accessible via the admin screen - if you disable all modules, a user can still login via mobile but they can't do anything.

https://support.sugarcrm.com/Documentation/Sugar_Versions/10.1/Sell/Administration_Guide/System/#Enabling_Modules_for_Mobile_Access 

You can control what modules are accessible via the admin screen - if you disable all modules, a user can still login via mobile but they can't do anything.

https://support.sugarcrm.com/Documentation/Sugar_Versions/10.1/Sell/Administration_Guide/System/#Enabling_Modules_for_Mobile_Access