WhatsApp won’t let you message a number that isn’t in your address book. That’s usually fine — until a delivery person asks for your address and you don’t want to save their number forever.

OnceMessage opens WhatsApp for any number (with country code) so you can send a message without saving the contact.

1. Enter the phone number with the country code.
2. Open WhatsApp from the app.
3. Send your message — no contact saved.

Use it for one-off chats with drivers, vendors, or anyone you don’t need in your address book.