Yes, for confirmation and light nurture - but WhatsApp Business with consent, PECR compliance, and full record retention. Avoid personal numbers.
Rules
- Use WhatsApp Business API, not personal number - Capture explicit consent on the form - Retain conversation as part of client record (often 6 years) - Do not use for financial advice - use for logistics and links
Impact
Response rates beat SMS 2-3x; misuse risks GDPR and FCA scrutiny.