If you’re running the DL09 software and you use pattern unlock, your emergency dialer may not work. To check your software version, go to: Applications>Settings>About Phone and look at the build number. To ensure that everything is working correctly until the update is available, disable pattern unlock. DL09 is the only version crippled at this time, other versions are fine. An estimated time on the fix has not been released as of yet.
“Free VZW Msg(s) – Use of your emergency call button on your Fascinate phone with software SCH-i500.DL09 may not work while the phone is locked. A software fix will be pushed to your device soon. Until available, disable pattern lock to ensure emergency calls can be placed. To check your software version press Applications>Settings>About phone and view Build number. Only version SCHi-500.DL09 is impacted by this issue. Versions SCH-i500.DI01 and SCH-i500.DH12 are functioning properly. To disable pattern lock press Applications>Settings>Location & Security and remove check from Require Pattern.â€
Source: Android Central Forum
