inBetween

inBetween lets a small team work from one WhatsApp Business number. Incoming customer messages are forwarded automatically to the coworker who handles them, and replies go back to the customer from the business number, so customers never see a private number. Works with your existing number via linked devices (like WhatsApp Web): no WhatsApp Business API approval and no new app for your team. Free plan available; new accounts get 30 days of Pro+ free without a card.