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WhatsApp vs SMS for optical shops: which to use for reminders and offers

Published 7 October 2026 · 1 min read · By Rushikesh Yadav

Opticdigit app sign-in screen on a phone next to the Opticdigit mobile printer

Most optical shops already chat with customers on WhatsApp. But personal chats don't scale to hundreds of reminders a month. Here is how WhatsApp and SMS compare when you want to message customers regularly.

At a glance

	SMS	WhatsApp
Reaches	Every mobile phone, no internet needed	Customers with WhatsApp and data
Rich content	Text only	Images, PDFs, buttons
Sending in bulk	Through an SMS provider with DLT registration	Through the WhatsApp Business Platform, with approved templates
Cost	Per SMS through a provider	The Business app is free for one-to-one chats; the Business Platform is paid per message
Best for	Reminders and alerts that must reach everyone	Sharing bills as PDF, photos of frames, conversations

Rules to follow

SMS: business messages in India go through a sender ID and templates registered on a DLT portal under TRAI's rules.
WhatsApp: customers must have agreed to hear from you, and business-initiated messages through the Business Platform use templates approved by WhatsApp.
Both: stop messaging anyone who asks, and keep promotions occasional.

A practical split

Eye test due, glasses ready and reorder reminders: SMS, because it reaches everyone.
Bill PDF, frame photos and questions: WhatsApp chat.
Festival offers: SMS to everyone, plus a WhatsApp status or post for customers who follow you.

Opticdigit sends thank-you messages, reminders and offers by SMS or WhatsApp under your shop's name, and on every plan you can share any bill on WhatsApp from your shop's own number in one tap.