One user just send as a question:
I want to learn how to send a message to over 50 contacts on WhatsApp at once?
How is it done?
First, you need to have as contacts all these numbers but also, they MUST have you as a contact in their phone. Otherwise a Broadcast message will not reach your contact.
This is the reason is very important to keep your contact list clean and updated. Be sure everyone who is important to you is a contact in your contact list and also he / she has your contact in their contact list.
If that is happening, you can create your Broadcast list.
Go to your WhatsApp Application and on the top of your messages, you will see the icon.
Create a new broadcast list and choose the contacts you want to add.
Create the broadcast list and then Send the message.
You can add up to 256 users to these “Broadcast Lists”.