diff --git a/BoardInterface.cpp b/BoardInterface.cpp
index f763438..0e10bbf 100644
--- a/BoardInterface.cpp
+++ b/BoardInterface.cpp
@@ -36,6 +36,13 @@ void BoardInterface::shutdownDevice() {
   displayMessage("Shutdown in 3 sec.", "");
   delay(3000);
 
+#ifdef SIM800L_ENABLED
+  if(sim800l->isConnectedGPRS()) {
+    sim800l->disconnectGPRS();
+  }
+  sim800l->setPowerMode(MINIMUM);
+#endif //SIM800L_ENABLED
+
   setCpuFrequencyMhz(80);
   setBrightness(0);
   //WiFi.disconnect(true);
diff --git a/evDash.ino b/evDash.ino
index c46301c..caf01a9 100644
--- a/evDash.ino
+++ b/evDash.ino
@@ -23,7 +23,7 @@
   - TinyGPSPlus (m5stack GPS)
 
   SIM800L m5stack (https://github.com/kolaCZek)
-  - SIM800L.h, SoftwareSerial.h
+  - SIM800L.h
 */
 
 ////////////////////////////////////////////////////////////