diff --git a/apps/ios/Shared/Views/Chat/Group/GroupPreferencesView.swift b/apps/ios/Shared/Views/Chat/Group/GroupPreferencesView.swift
index da15ab98a5..d9db16b559 100644
--- a/apps/ios/Shared/Views/Chat/Group/GroupPreferencesView.swift
+++ b/apps/ios/Shared/Views/Chat/Group/GroupPreferencesView.swift
@@ -50,8 +50,21 @@ struct GroupPreferencesView: View {
                     featureSection(.history, $preferences.history.enable)
                     featureSection(.support, $preferences.support.enable, disabled: true)
                 } else {
-                    // hidden until message signing is user-facing (recipient-only stage)
-//                    featureSection(.signMessages, $preferences.signMessages.enable)
+                    featureSection(.signMessages, $preferences.signMessages.enable)
+                        .onChange(of: preferences.signMessages.enable) { enable in
+                            if enable == .on {
+                                showAlert(
+                                    NSLocalizedString("Sign messages?", comment: "alert title"),
+                                    message: NSLocalizedString("Messages sent before will show \"signature missing\" to subscribers who join later.", comment: "alert message"),
+                                    actions: {[
+                                        UIAlertAction(title: NSLocalizedString("Enable", comment: "alert button"), style: .default) { _ in },
+                                        UIAlertAction(title: NSLocalizedString("Cancel", comment: "alert button"), style: .cancel) { _ in
+                                            preferences.signMessages.enable = .off
+                                        }
+                                    ]}
+                                )
+                            }
+                        }
                     featureSection(.timedMessages, $preferences.timedMessages.enable)
                     featureSection(.fullDelete, $preferences.fullDelete.enable)
                     featureSection(.reactions, $preferences.reactions.enable)
diff --git a/apps/ios/SimpleXChat/ChatTypes.swift b/apps/ios/SimpleXChat/ChatTypes.swift
index c77811f969..68300193d5 100644
--- a/apps/ios/SimpleXChat/ChatTypes.swift
+++ b/apps/ios/SimpleXChat/ChatTypes.swift
@@ -3158,7 +3158,7 @@ public enum MsgVerified: Decodable, Equatable, Hashable {
         switch self {
         case .sigMissing: return (
                 NSLocalizedString("Signature missing", comment: "alert title"),
-                NSLocalizedString("The channel required this message to be signed, but the signature is missing.", comment: "alert message")
+                NSLocalizedString("This channel requires signed messages, but this message has no signature. It may have been sent before signing was required, or a relay may have forwarded it without one.", comment: "alert message")
             )
         default: return nil
         }
diff --git a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/group/GroupPreferences.kt b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/group/GroupPreferences.kt
index bd3af10c37..2be256d074 100644
--- a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/group/GroupPreferences.kt
+++ b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/group/GroupPreferences.kt
@@ -178,10 +178,14 @@ private fun GroupPreferencesLayout(
       }
     }
   }
-  @Composable fun SignMessagesPreference() {
+  @Composable fun SignMessagesPreference(onEnable: ((() -> Unit) -> Unit)? = null) {
     val enableSignMessages = remember(preferences) { mutableStateOf(preferences.signMessages.enable) }
     FeatureSection(GroupFeature.SignMessages, enableSignMessages, null, groupInfo, preferences, onTTLUpdated) { enable, _ ->
       applyPrefs(preferences.copy(signMessages = GroupPreference(enable = enable)))
+      if (enable == GroupFeatureEnabled.ON) onEnable?.invoke {
+        enableSignMessages.value = GroupFeatureEnabled.OFF
+        applyPrefs(preferences.copy(signMessages = GroupPreference(enable = GroupFeatureEnabled.OFF)))
+      }
     }
   }
   ColumnWithScrollBar {
@@ -216,9 +220,16 @@ private fun GroupPreferencesLayout(
       SectionDividerSpaced()
       SupportPreference(disabled = true)
     } else {
-      // hidden until message signing is user-facing (recipient-only stage)
-//      SignMessagesPreference()
-//      SectionDividerSpaced()
+      SignMessagesPreference(onEnable = { revert ->
+        AlertManager.shared.showAlertDialog(
+          title = generalGetString(MR.strings.sign_messages_question),
+          text = generalGetString(MR.strings.sign_messages_alert_desc),
+          confirmText = generalGetString(MR.strings.sign_messages_enable),
+          onDismiss = revert,
+          onDismissRequest = revert,
+        )
+      })
+      SectionDividerSpaced()
       TimedMessagesPreference()
       SectionDividerSpaced()
       FullDeletePreference()
diff --git a/apps/multiplatform/common/src/commonMain/moko-resources/base/strings.xml b/apps/multiplatform/common/src/commonMain/moko-resources/base/strings.xml
index cd80492607..793d72244b 100644
--- a/apps/multiplatform/common/src/commonMain/moko-resources/base/strings.xml
+++ b/apps/multiplatform/common/src/commonMain/moko-resources/base/strings.xml
@@ -787,10 +787,13 @@
   <string name="do_not_require_message_signatures">Do not require signing messages.</string>
   <string name="message_signatures_are_required">Message signing is required.</string>
   <string name="message_signatures_are_not_required">Message signing is not required.</string>
+  <string name="sign_messages_question">Sign messages?</string>
+  <string name="sign_messages_alert_desc">Messages sent before will show "signature missing" to subscribers who join later.</string>
+  <string name="sign_messages_enable">Enable</string>
   <string name="show_signature">Show signature</string>
   <string name="show_encryption">Show encryption</string>
   <string name="signature_missing_alert_title">Signature missing</string>
-  <string name="signature_missing_alert_desc">The channel required this message to be signed, but the signature is missing.</string>
+  <string name="signature_missing_alert_desc">This channel requires signed messages, but this message has no signature. It may have been sent before signing was required, or a relay may have forwarded it without one.</string>
   <string name="live_message">Live message!</string>
   <string name="send_live_message_desc">Send a live message - it will update for the recipient(s) as you type it</string>
   <string name="send_verb">Send</string>