diff --git a/src/main/java/cn/jpush/api/device/DeviceClient.java b/src/main/java/cn/jpush/api/device/DeviceClient.java
index d1f21747..5ef25460 100644
--- a/src/main/java/cn/jpush/api/device/DeviceClient.java
+++ b/src/main/java/cn/jpush/api/device/DeviceClient.java
@@ -138,7 +138,12 @@ public DefaultResult updateDeviceTagAlias(String registrationId, String alias,
     public DefaultResult bindMobile(String registrationId, String mobile)
             throws APIConnectionException, APIRequestException
     {
-        Preconditions.checkArgument(StringUtils.isMobileNumber(mobile), "The mobile format is incorrect. " + mobile);
+
+        if ("".equals(mobile)) {
+            // delete bind while mobile is empty.
+        } else {
+            Preconditions.checkArgument(StringUtils.isMobileNumber(mobile), "The mobile format is incorrect. " + mobile);
+        }
 
         String url = hostName + devicesPath + "/" + registrationId;
         JsonObject top = new JsonObject();
diff --git a/src/main/java/cn/jpush/api/report/ReceivedsResult.java b/src/main/java/cn/jpush/api/report/ReceivedsResult.java
index b41a356b..3eeeab11 100644
--- a/src/main/java/cn/jpush/api/report/ReceivedsResult.java
+++ b/src/main/java/cn/jpush/api/report/ReceivedsResult.java
@@ -25,7 +25,7 @@ public static class Received {
         @Expose
         public int ios_apns_sent;
         @Expose
-        public int ios_msg_receive;
+        public int ios_msg_received;
         @Expose
         public int wp_mpns_sent;
     }