As we have said above, you can send 1000 Whatsapp messages at once. Here’s how.
Create a group by adding the 100 contact numbers that you need to send a message to, to it. Once created, send a message to the group. It is sent to all 100 contacts simultaneously. However, adding all those 100 contacts takes a humongous time.
Alternatively, you can send a broadcast message instead of creating a group. This way you can avoid adding all 100 contacts one by one. Find the steps below to send broadcast messages on Android and iOS versions.
P.S note: your number should be saved in their contacts list to be able to send broadcast messages.
Using an Android phone,
Using an iOS phone,
Now, you are ready to launch a broadcast message to 100 contacts at one time using your android/iOS device.