diff --git a/scripts/toggle-sim-slot b/scripts/toggle-sim-slot
new file mode 100644
index 0000000..8d865ef
--- /dev/null
+++ b/scripts/toggle-sim-slot
@@ -0,0 +1,12 @@
+# Applicable for RouterOS above 6.45.1
+# see https://wiki.mikrotik.com/wiki/Dual_SIM_Application#Initial_settings
+
+:log "info" "SIM toggled by the script"
+
+:local simSlot [/system routerboard modem get sim-slot]
+
+:if ( $simSlot = "a" ) do={
+  /system routerboard modem set sim-slot=b
+} else={
+  /system routerboard modem set sim-slot=a
+}