diff --git a/native/cpp/CommonCpp/NativeModules/CommRustModule.h b/native/cpp/CommonCpp/NativeModules/CommRustModule.h
--- a/native/cpp/CommonCpp/NativeModules/CommRustModule.h
+++ b/native/cpp/CommonCpp/NativeModules/CommRustModule.h
@@ -98,6 +98,18 @@
       jsi::String authDeviceID,
       jsi::String authAccessToken,
       jsi::String updatePayload) override;
+  virtual jsi::Value uploadSecondaryDeviceKeysAndLogIn(
+      jsi::Runtime &rt,
+      jsi::String userID,
+      jsi::String challengeResponse,
+      jsi::String keyPayload,
+      jsi::String keyPayloadSignature,
+      jsi::String contentPrekey,
+      jsi::String contentPrekeySignature,
+      jsi::String notifPrekey,
+      jsi::String notifPrekeySignature,
+      jsi::Array contentOneTimeKeys,
+      jsi::Array notifOneTimeKeys) override;
 
 public:
   CommRustModule(std::shared_ptr<facebook::react::CallInvoker> jsInvoker);
diff --git a/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp b/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp
--- a/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp
+++ b/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp
@@ -473,4 +473,58 @@
       });
 }
 
+jsi::Value CommRustModule::uploadSecondaryDeviceKeysAndLogIn(
+    jsi::Runtime &rt,
+    jsi::String userID,
+    jsi::String challengeResponse,
+    jsi::String keyPayload,
+    jsi::String keyPayloadSignature,
+    jsi::String contentPrekey,
+    jsi::String contentPrekeySignature,
+    jsi::String notifPrekey,
+    jsi::String notifPrekeySignature,
+    jsi::Array contentOneTimeKeys,
+    jsi::Array notifOneTimeKeys) {
+  auto userIDRust = jsiStringToRustString(userID, rt);
+  auto challengeResponseRust = jsiStringToRustString(challengeResponse, rt);
+  auto keyPayloadRust = jsiStringToRustString(keyPayload, rt);
+  auto keyPayloadSignatureRust = jsiStringToRustString(keyPayloadSignature, rt);
+  auto contentPrekeyRust = jsiStringToRustString(contentPrekey, rt);
+  auto contentPrekeySignatureRust =
+      jsiStringToRustString(contentPrekeySignature, rt);
+  auto notifPrekeyRust = jsiStringToRustString(notifPrekey, rt);
+  auto notifPrekeySignatureRust =
+      jsiStringToRustString(notifPrekeySignature, rt);
+  auto contentOneTimeKeysRust = jsiStringArrayToRustVec(contentOneTimeKeys, rt);
+  auto notifOneTimeKeysRust = jsiStringArrayToRustVec(notifOneTimeKeys, rt);
+
+  return createPromiseAsJSIValue(
+      rt, [=, this](jsi::Runtime &innerRt, std::shared_ptr<Promise> promise) {
+        std::string error;
+        try {
+          auto currentID = RustPromiseManager::instance.addPromise(
+              {promise, this->jsInvoker_, innerRt});
+          identityUploadSecondaryDeviceKeysAndLogIn(
+              userIDRust,
+              challengeResponseRust,
+              keyPayloadRust,
+              keyPayloadSignatureRust,
+              contentPrekeyRust,
+              contentPrekeySignatureRust,
+              notifPrekeyRust,
+              notifPrekeySignatureRust,
+              contentOneTimeKeysRust,
+              notifOneTimeKeysRust,
+              currentID);
+        } catch (const std::exception &e) {
+          error = e.what();
+        };
+        if (!error.empty()) {
+          this->jsInvoker_->invokeAsync(
+              [error, promise]() { promise->reject(error); });
+        }
+      });
+  return jsi::Value::undefined();
+}
+
 } // namespace comm
diff --git a/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp b/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp
--- a/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp
+++ b/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp
@@ -51,6 +51,9 @@
 static jsi::Value __hostFunction_CommRustModuleSchemaCxxSpecJSI_updateDeviceList(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
   return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->updateDeviceList(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt));
 }
+static jsi::Value __hostFunction_CommRustModuleSchemaCxxSpecJSI_uploadSecondaryDeviceKeysAndLogIn(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
+  return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->uploadSecondaryDeviceKeysAndLogIn(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt), args[8].asObject(rt).asArray(rt), args[9].asObject(rt).asArray(rt));
+}
 
 CommRustModuleSchemaCxxSpecJSI::CommRustModuleSchemaCxxSpecJSI(std::shared_ptr<CallInvoker> jsInvoker)
   : TurboModule("CommRustTurboModule", jsInvoker) {
@@ -67,6 +70,7 @@
   methodMap_["getKeyserverKeys"] = MethodMetadata {4, __hostFunction_CommRustModuleSchemaCxxSpecJSI_getKeyserverKeys};
   methodMap_["getDeviceListForUser"] = MethodMetadata {5, __hostFunction_CommRustModuleSchemaCxxSpecJSI_getDeviceListForUser};
   methodMap_["updateDeviceList"] = MethodMetadata {4, __hostFunction_CommRustModuleSchemaCxxSpecJSI_updateDeviceList};
+  methodMap_["uploadSecondaryDeviceKeysAndLogIn"] = MethodMetadata {10, __hostFunction_CommRustModuleSchemaCxxSpecJSI_uploadSecondaryDeviceKeysAndLogIn};
 }
 
 
diff --git a/native/cpp/CommonCpp/_generated/rustJSI.h b/native/cpp/CommonCpp/_generated/rustJSI.h
--- a/native/cpp/CommonCpp/_generated/rustJSI.h
+++ b/native/cpp/CommonCpp/_generated/rustJSI.h
@@ -33,6 +33,7 @@
   virtual jsi::Value getKeyserverKeys(jsi::Runtime &rt, jsi::String authUserID, jsi::String authDeviceID, jsi::String authAccessToken, jsi::String keyserverID) = 0;
   virtual jsi::Value getDeviceListForUser(jsi::Runtime &rt, jsi::String authUserID, jsi::String authDeviceID, jsi::String authAccessToken, jsi::String userID, std::optional<double> sinceTimestamp) = 0;
   virtual jsi::Value updateDeviceList(jsi::Runtime &rt, jsi::String authUserID, jsi::String authDeviceID, jsi::String authAccessToken, jsi::String updatePayload) = 0;
+  virtual jsi::Value uploadSecondaryDeviceKeysAndLogIn(jsi::Runtime &rt, jsi::String userID, jsi::String challengeResponse, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys) = 0;
 
 };
 
@@ -158,6 +159,14 @@
       return bridging::callFromJs<jsi::Value>(
           rt, &T::updateDeviceList, jsInvoker_, instance_, std::move(authUserID), std::move(authDeviceID), std::move(authAccessToken), std::move(updatePayload));
     }
+    jsi::Value uploadSecondaryDeviceKeysAndLogIn(jsi::Runtime &rt, jsi::String userID, jsi::String challengeResponse, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys) override {
+      static_assert(
+          bridging::getParameterCount(&T::uploadSecondaryDeviceKeysAndLogIn) == 11,
+          "Expected uploadSecondaryDeviceKeysAndLogIn(...) to have 11 parameters");
+
+      return bridging::callFromJs<jsi::Value>(
+          rt, &T::uploadSecondaryDeviceKeysAndLogIn, jsInvoker_, instance_, std::move(userID), std::move(challengeResponse), std::move(keyPayload), std::move(keyPayloadSignature), std::move(contentPrekey), std::move(contentPrekeySignature), std::move(notifPrekey), std::move(notifPrekeySignature), std::move(contentOneTimeKeys), std::move(notifOneTimeKeys));
+    }
 
   private:
     T *instance_;
diff --git a/native/native_rust_library/src/lib.rs b/native/native_rust_library/src/lib.rs
--- a/native/native_rust_library/src/lib.rs
+++ b/native/native_rust_library/src/lib.rs
@@ -12,9 +12,10 @@
   UploadOneTimeKeysRequest,
 };
 use grpc_clients::identity::protos::unauth::{
-  DeviceKeyUpload, DeviceType, Empty, IdentityKeyInfo,
+  AuthResponse, DeviceKeyUpload, DeviceType, Empty, IdentityKeyInfo,
   OpaqueLoginFinishRequest, OpaqueLoginStartRequest, Prekey,
-  RegistrationFinishRequest, RegistrationStartRequest, WalletLoginRequest,
+  RegistrationFinishRequest, RegistrationStartRequest,
+  SecondaryDeviceKeysUploadRequest, WalletLoginRequest,
 };
 use grpc_clients::identity::{
   get_auth_client, get_unauthenticated_client, REQUEST_METADATA_COOKIE_KEY,
@@ -193,6 +194,21 @@
       promise_id: u32,
     );
 
+    #[cxx_name = "identityUploadSecondaryDeviceKeysAndLogIn"]
+    fn upload_secondary_device_keys_and_log_in(
+      user_id: String,
+      challenge_response: String,
+      key_payload: String,
+      key_payload_signature: String,
+      content_prekey: String,
+      content_prekey_signature: String,
+      notif_prekey: String,
+      notif_prekey_signature: String,
+      content_one_time_keys: Vec<String>,
+      notif_one_time_keys: Vec<String>,
+      promise_id: u32,
+    );
+
     // Argon2
     #[cxx_name = "compute_backup_key"]
     fn compute_backup_key_str(
@@ -525,6 +541,19 @@
   access_token: String,
 }
 
+impl From<AuthResponse> for UserIDAndDeviceAccessToken {
+  fn from(value: AuthResponse) -> Self {
+    let AuthResponse {
+      user_id,
+      access_token,
+    } = value;
+    Self {
+      user_id,
+      access_token,
+    }
+  }
+}
+
 async fn register_user_helper(
   password_user_info: PasswordUserInfo,
 ) -> Result<String, Error> {
@@ -600,10 +629,8 @@
     .register_password_user_finish(finish_request)
     .await?
     .into_inner();
-  let user_id_and_access_token = UserIDAndDeviceAccessToken {
-    user_id: registration_finish_response.user_id,
-    access_token: registration_finish_response.access_token,
-  };
+  let user_id_and_access_token =
+    UserIDAndDeviceAccessToken::from(registration_finish_response);
   Ok(serde_json::to_string(&user_id_and_access_token)?)
 }
 
@@ -712,10 +739,8 @@
     .log_in_password_user_finish(finish_request)
     .await?
     .into_inner();
-  let user_id_and_access_token = UserIDAndDeviceAccessToken {
-    user_id: login_finish_response.user_id,
-    access_token: login_finish_response.access_token,
-  };
+  let user_id_and_access_token =
+    UserIDAndDeviceAccessToken::from(login_finish_response);
   Ok(serde_json::to_string(&user_id_and_access_token)?)
 }
 
@@ -802,10 +827,8 @@
     .await?
     .into_inner();
 
-  let user_id_and_access_token = UserIDAndDeviceAccessToken {
-    user_id: login_response.user_id,
-    access_token: login_response.access_token,
-  };
+  let user_id_and_access_token =
+    UserIDAndDeviceAccessToken::from(login_response);
   Ok(serde_json::to_string(&user_id_and_access_token)?)
 }
 
@@ -1353,6 +1376,76 @@
   Ok(())
 }
 
+fn upload_secondary_device_keys_and_log_in(
+  user_id: String,
+  challenge_response: String,
+  key_payload: String,
+  key_payload_signature: String,
+  content_prekey: String,
+  content_prekey_signature: String,
+  notif_prekey: String,
+  notif_prekey_signature: String,
+  content_one_time_keys: Vec<String>,
+  notif_one_time_keys: Vec<String>,
+  promise_id: u32,
+) {
+  RUNTIME.spawn(async move {
+    let device_key_upload = DeviceKeyUpload {
+      device_key_info: Some(IdentityKeyInfo {
+        payload: key_payload,
+        payload_signature: key_payload_signature,
+        social_proof: None,
+      }),
+      content_upload: Some(Prekey {
+        prekey: content_prekey,
+        prekey_signature: content_prekey_signature,
+      }),
+      notif_upload: Some(Prekey {
+        prekey: notif_prekey,
+        prekey_signature: notif_prekey_signature,
+      }),
+      one_time_content_prekeys: content_one_time_keys,
+      one_time_notif_prekeys: notif_one_time_keys,
+      device_type: DEVICE_TYPE.into(),
+    };
+
+    let result = upload_secondary_device_keys_and_log_in_helper(
+      user_id,
+      challenge_response,
+      device_key_upload,
+    )
+    .await;
+    handle_string_result_as_callback(result, promise_id);
+  });
+}
+
+async fn upload_secondary_device_keys_and_log_in_helper(
+  user_id: String,
+  challenge_response: String,
+  device_key_upload: DeviceKeyUpload,
+) -> Result<String, Error> {
+  let mut identity_client = get_unauthenticated_client(
+    IDENTITY_SOCKET_ADDR,
+    CODE_VERSION,
+    DEVICE_TYPE.as_str_name().to_lowercase(),
+  )
+  .await?;
+
+  let request = SecondaryDeviceKeysUploadRequest {
+    user_id,
+    challenge_response,
+    device_key_upload: Some(device_key_upload),
+  };
+
+  let response = identity_client
+    .upload_keys_for_registered_device_and_log_in(request)
+    .await?
+    .into_inner();
+
+  let user_id_and_access_token = UserIDAndDeviceAccessToken::from(response);
+  Ok(serde_json::to_string(&user_id_and_access_token)?)
+}
+
 #[derive(
   Debug, derive_more::Display, derive_more::From, derive_more::Error,
 )]
diff --git a/native/schema/CommRustModuleSchema.js b/native/schema/CommRustModuleSchema.js
--- a/native/schema/CommRustModuleSchema.js
+++ b/native/schema/CommRustModuleSchema.js
@@ -93,6 +93,18 @@
     authAccessToken: string,
     updatePayload: string,
   ) => Promise<void>;
+  +uploadSecondaryDeviceKeysAndLogIn: (
+    userID: string,
+    challengeResponse: string,
+    keyPayload: string,
+    keyPayloadSignature: string,
+    contentPrekey: string,
+    contentPrekeySignature: string,
+    notifPrekey: string,
+    notifPrekeySignature: string,
+    contentOneTimeKeys: $ReadOnlyArray<string>,
+    notifOneTimeKeys: $ReadOnlyArray<string>,
+  ) => Promise<string>;
 }
 
 export default (TurboModuleRegistry.getEnforcing<Spec>(