On iPhone/iPad Echofon requires you to enable push notification even you only want to sync with other Echofon. Make sure following things/settings to enable sync.

1. Set both Push Notification and *Sync with Desktop from Accounts Settings View. (Open Menu then Tap (>) icon right next to your account)
2. Make sure push is enabled on system Settings.app (Apple system wide preference application.)

If it still doesn't work, please try following:

1. Re-install Echofon (Delete and download it from AppStore. Not re-sync from iTunes)
2. If it still doesn't work, click here to start discussion with your screen name. We'll check our server entity.