Echofon does NOT send push notifications in the following situations:

1. Sleep settings are in effect. Modify these settings under Menu > Account Options > Push Notifications > Sleep
   
2. Echofon for Mac or Firefox is running and being actively used on your computer.
   
3. Make sure push is enabled on system Settings.app (Apple system wide preference application)
   
4. You are opening Echofon on your iPhone.
   
5. You are using a jailbroken iPhone.