You can Clock In/Out and Check In/Out from Check In/Out page when you are offline. The Check In/Out details are saved and posted in Salesforce once you have a proper data connectivity on the mobile.
You cannot Check In/Out for Travel/Job from Everyone/Users page when you are working Offline. Check Ins or Check Outs made from Everyone/Users page are not saved when you are offline.
So we suggest you use only My Team or Check In/Out page for Check In/Out when you are offline.