Ebu8b
Sorry, there weren't 3 ways, there were 4. Before the update, you were able to do a check in once every day on desktop, mobile browser, android app and ios app. You were able to check in 4 times basically. Now, you're only allowed to check in once per account every day, reducing the number of spirit stones you can get...
(plz take no offence... this humble one simply tries to state the truth)