Can I message customers who have not saved my number on WhatsApp?

Not with a normal broadcast list. Only people who saved your number get it. A paid marketing message can reach the rest.

• Turning a broadcast into a marketing message lets it reach people who do not have your number saved.
• With business broadcasts you pay for each message that is delivered.
• Ask customers to save your number and agree to offers first.
• Only message people who asked to hear from you.