diff --git a/native/account/registration/keyserver-selection.react.js b/native/account/registration/keyserver-selection.react.js
--- a/native/account/registration/keyserver-selection.react.js
+++ b/native/account/registration/keyserver-selection.react.js
@@ -41,6 +41,13 @@
     setCurrentSelection('custom');
   }, []);
 
+  let buttonState = 'disabled';
+  if (
+    currentSelection === 'ashoat' ||
+    (currentSelection === 'custom' && customKeyserver)
+  ) {
+    buttonState = 'enabled';
+  }
   const onSubmit = React.useCallback(() => {}, []);
 
   const styles = useStyles(unboundStyles);
@@ -93,7 +100,7 @@
           />
         </RegistrationTile>
       </RegistrationContainer>
-      <RegistrationButton onPress={onSubmit} label="Next" />
+      <RegistrationButton onPress={onSubmit} label="Next" state={buttonState} />
     </View>
   );
 }
diff --git a/native/account/registration/registration-button.react.js b/native/account/registration/registration-button.react.js
--- a/native/account/registration/registration-button.react.js
+++ b/native/account/registration/registration-button.react.js
@@ -9,13 +9,34 @@
 type Props = {
   +onPress: () => mixed,
   +label: string,
+  +state?: 'enabled' | 'disabled' | 'loading',
 };
 function RegistrationButton(props: Props): React.Node {
-  const { onPress, label } = props;
+  const { onPress, label, state } = props;
+
   const styles = useStyles(unboundStyles);
+  const buttonStyle = React.useMemo(() => {
+    if (state === 'disabled' || state === 'loading') {
+      return [styles.button, styles.disabledButton];
+    } else {
+      return styles.button;
+    }
+  }, [state, styles.button, styles.disabledButton]);
+  const buttonTextStyle = React.useMemo(() => {
+    if (state === 'disabled') {
+      return [styles.buttonText, styles.disabledButtonText];
+    }
+    return styles.buttonText;
+  }, [state, styles.buttonText, styles.disabledButtonText]);
+
   return (
-    <Button onPress={onPress} iosActiveOpacity={0.6} style={styles.button}>
-      <Text style={styles.buttonText}>{label}</Text>
+    <Button
+      onPress={onPress}
+      iosActiveOpacity={0.6}
+      style={buttonStyle}
+      disabled={state === 'disabled' || state === 'loading'}
+    >
+      <Text style={buttonTextStyle}>{label}</Text>
     </Button>
   );
 }
@@ -32,6 +53,12 @@
     textAlign: 'center',
     padding: 12,
   },
+  disabledButton: {
+    backgroundColor: 'disabledButton',
+  },
+  disabledButtonText: {
+    color: 'disabledButtonText',
+  },
 };
 
 export default RegistrationButton;
diff --git a/native/themes/colors.js b/native/themes/colors.js
--- a/native/themes/colors.js
+++ b/native/themes/colors.js
@@ -15,6 +15,7 @@
   blockQuoteBorder: '#CCCCCC',
   codeBackground: '#E0E0E0',
   disabledButton: '#E0E0E0',
+  disabledButtonText: '#808080',
   disconnectedBarBackground: '#F5F5F5',
   editButton: '#A4A4A2',
   floatingButtonBackground: '#999999',
@@ -102,6 +103,7 @@
   blockQuoteBorder: '#808080',
   codeBackground: '#0A0A0A',
   disabledButton: '#404040',
+  disabledButtonText: '#808080',
   disconnectedBarBackground: '#1F1F1F',
   editButton: '#666666',
   floatingButtonBackground: '#666666',