While you're applying for a job, the manager might contact you via Workmate group chat. This feature is in your Workmate for Worker app, therefore you don't need to use your personal number or other messaging apps.
Chats can be found in the Inbox tab. When you are added into a group chat, the group will be shown here. Regularly check this tab to check incoming chats from your manager.
All chats from your manager or other members will be visible in the group chat. When you read the message, your manager will receive a read receipt. To reply the message, simply type your reply and tap send