diff --git a/src/Command/WarrantySMSCommand.php b/src/Command/WarrantySMSCommand.php
index 3e8591aa..8e0f9fc0 100644
--- a/src/Command/WarrantySMSCommand.php
+++ b/src/Command/WarrantySMSCommand.php
@@ -45,7 +45,26 @@ class WarrantySMSCommand extends Command
 
         foreach ($warrs as $w)
         {
-            error_log($w->getID());
+            error_log($w->getID() . ' - ' . $w->getMobileNumber());
+            // check valid number
+            $num = trim($w->getMobileNumber());
+
+            // should start with '9'
+            if ($num[0] != '9')
+                continue;
+
+            // should be 10 digits
+            if (strlen($num) != 10)
+                continue;
+
+            // should be numeric
+            if (!is_numeric($num))
+                continue;
+
+            error_log('valid!');
+
+            // add 63 prefix
+            $num = '63' . $num;
         }
 
         /*