A contact who shown as Standby in my list, now changed to Offline. If you have been signed out of Zello for 60 days, your status will automatically change from Standby to Offline. You cannot send messages to a contact who shows as 'Offline' in your contact-list. Zello Support October 26, 2016 16:08 Follow Have more questions? Submit a request 0 Comments Article is closed for comments.