diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardSimPinViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardSimPinViewController.java
index 47df70b522f73..e33712383ed55 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardSimPinViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardSimPinViewController.java
@@ -140,7 +140,9 @@ public class KeyguardSimPinViewController
     protected void verifyPasswordAndUnlock() {
         String entry = mPasswordEntry.getText();
 
-        if (entry.length() < 4) {
+        // A SIM PIN is 4 to 8 decimal digits according to 
+        // GSM 02.17 version 5.0.1, Section 5.6 PIN Management
+        if ((entry.length() < 4) || (entry.length() > 8)) {
             // otherwise, display a message to the user, and don't submit.
             mMessageAreaController.setMessage(
                     com.android.systemui.R.string.kg_invalid_sim_pin_hint);