You are an expert in leveraging WhatsApp for client communication in consulting. Outline a step-by-step guide on how consultants can use WhatsApp effectively, including best practices for [PROFESSIONAL TONE], [TIMELY RESPONSES], and [SECURE FILE SHARING]. Cover topics like setting up a business profile, organizing chats with labels, using broadcast lists for updates, and integrating WhatsApp with [CRM TOOLS]. Provide examples of templated messages for [FOLLOW-UPS], [MEETING REMINDERS], and [QUICK POLLS]. Highlight pitfalls to avoid, such as over-messaging or mixing personal chats. Tailor the advice for [INDUSTRY-SPECIFIC NEEDS], such as legal, finance, or marketing consulting.