Sonic Sender is your helping hand for sending messages with WhatsApp. Send customized and personalized messages to all your contacts (or groups) at once. You can also attach files and media. Your contacts would get personalized messages, with their First Name, Last Name or any other parameter you choose. Try the App Now ! Sonic Sender does all the boring hard work for you by allowing you to send messages in bulk at once. Sonic Sender is super fast, easy to use and has some cool features, th