Where SMS works better
SMS needs no app or internet connection, so it reaches nearly every phone. It suits OTPs, payment alerts, appointment reminders and short offers. In India, business SMS needs a registered sender ID and approved templates.
Where WhatsApp works better
WhatsApp allows images, documents, buttons and two-way conversation. It suits order updates, catalogues, support and follow-ups where customers are likely to reply. Customers must opt in, and promotional messages need approved templates.
Using both
Many businesses use SMS for time-critical, short messages and WhatsApp for conversation. Whichever you use, ask permission, keep messages relevant and make it easy to opt out.
Frequently asked questions
Can I send marketing messages from my personal WhatsApp?
Not safely. Bulk sending from a personal number risks a ban. Businesses should use WhatsApp Business with approved templates and opt-in.