diff --git a/app/src/main/res/layout/fragment_settings.xml b/app/src/main/res/layout/fragment_settings.xml
index 32f09872..d410bba4 100644
--- a/app/src/main/res/layout/fragment_settings.xml
+++ b/app/src/main/res/layout/fragment_settings.xml
@@ -1225,7 +1225,9 @@
                     android:layout_height="wrap_content"
                     android:layout_marginStart="5dp"
                     android:layout_weight="1"
+                    android:digits="0123456789"
                     android:hint="@string/sim_sub_id"
+                    android:inputType="number"
                     android:singleLine="true"
                     android:textAlignment="center"
                     app:met_allowEmpty="false"
@@ -1294,7 +1296,9 @@
                     android:layout_height="wrap_content"
                     android:layout_marginStart="5dp"
                     android:layout_weight="1"
+                    android:digits="0123456789"
                     android:hint="@string/sim_sub_id"
+                    android:inputType="number"
                     android:singleLine="true"
                     android:textAlignment="center"
                     app:met_allowEmpty="false"