diff --git a/index.js.in b/index.js.in
index efebcf44..9dc7f6d1 100644
--- a/index.js.in
+++ b/index.js.in
@@ -10,7 +10,8 @@
   var loadingPromises = [];
   if (config.midletClassName == "RunTests") {
     loadingPromises.push(loadScript("tests/contacts.js"),
-                         loadScript("tests/index.js"));
+                         loadScript("tests/index.js"),
+                         loadScript("tests/mozactivitymock.js"));
   }
 
   if (navigator.userAgent.indexOf('Chrome') > -1) {
@@ -746,5 +747,9 @@ DumbPipe.registerOpener("backgroundCheck", function(message, sender) {
 });
 
 DumbPipe.registerOpener("mozActivity", function(message, sender) {
-  new MozActivity(message);
+  var activity = new MozActivity(message);
+
+  activity.onsuccess = sender.bind(null, { type: "onsuccess" });
+
+  activity.onerror = sender.bind(null, { type: "onerror" });
 });
diff --git a/midp/sms.js b/midp/sms.js
index eda809ab..60f001d0 100644
--- a/midp/sms.js
+++ b/midp/sms.js
@@ -186,22 +186,25 @@ Native["com/sun/midp/io/j2me/sms/Protocol.send0.(IILjava/lang/String;II[B)I"] =
 function(handle, type, host, destPort, sourcePort, message) {
     var ctx = $.ctx;
     asyncImpl("I", new Promise(function(resolve, reject) {
-        var activity = new MozActivity({
+        var pipe = DumbPipe.open("mozActivity", {
             name: "new",
             data: {
-              type: "websms/sms",
-              number: J2ME.fromJavaString(host),
-              body: new TextDecoder('utf-16be').decode(message),
+                type: "websms/sms",
+                number: J2ME.fromJavaString(host),
+                body: new TextDecoder('utf-16be').decode(message),
             },
+        }, function(message) {
+            switch (message.type) {
+                case "onsuccess":
+                    DumbPipe.close(pipe);
+                    resolve(message.byteLength);
+                    break;
+
+                case "onerror":
+                    ctx.setAsCurrentContext();
+                    reject($.newIOException("Error while sending SMS message"));
+                    break;
+            }
         });
-
-        activity.onsuccess = function() {
-          resolve(message.byteLength);
-        };
-
-        activity.onerror = function() {
-          ctx.setAsCurrentContext();
-          reject($.newIOException("Error while sending SMS message"));
-        };
     }));
 };