Promotional SMS in India is effectively dead as a channel — filtered, ignored, and buried under the same messages from thirty other businesses. WhatsApp broadcasts work better but template approval and opt-in rules limit what a small retailer can do, and a marketing message competes with everything else in a busy inbox.
A voice announcement is a different proposition. It interrupts. That is its strength and it is also exactly why it must be used sparingly.
What a one-way call is
An announcement call plays a recorded or synthesised message and hangs up. The customer cannot reply. It costs ₹1.3–1.5 per minute against ₹4–5 for a two-way conversation, and most announcements run 15 to 25 seconds — so a few tens of paise per customer reached.
At that price you can call a five-thousand-name customer list for the cost of a modest print advertisement, and unlike the print ad you know exactly who answered.
When it is worth making
The test is whether the message is genuinely time-bound and genuinely relevant to the person receiving it.
| Worth calling | Not worth calling |
|---|---|
| A sale that starts tomorrow and ends Sunday | "Visit our store" with no occasion |
| A store reopening or new branch nearby | Generic monthly newsletter content |
| A pre-booked item now in stock | Anything the customer did not ask about |
| Festival timings or a special late night | A discount available all year |
| An event with limited seats | A list you bought rather than built |
The last row on the right is not a judgement call. Calling a purchased list is both ineffective and a compliance problem — consent and DNC rules in India apply, and an announcement to people who never gave you a number is exactly what those rules exist to prevent.
Writing an announcement people listen to
You have about four seconds before the customer decides whether to hang up. Everything depends on those four seconds carrying the store's name and the reason for the call.
Twenty seconds, spoken. Three rules behind it:
- Name the store first. A customer who does not know who is calling in the first three seconds hangs up, and rightly.
- One offer, not five. Nobody remembers a list read aloud. Pick the strongest.
- Say the dates and the address. This is the entire actionable content. A voice message cannot be scrolled back.
Frequency is the thing that kills it
The failure pattern is completely predictable. The first announcement performs well, so the retailer runs one a week, and within two months the answer rate has collapsed and customers are blocking the number.
A reasonable ceiling is one announcement per customer per month, and for most retailers once a quarter — tied to genuine events — works better than anything more frequent.
Treat it as a scarce resource. It is the only channel you have that reliably interrupts, and interruption stops working the moment it becomes routine.
Segment, even crudely
Calling your whole database with the same message wastes the channel. Even rough segmentation improves it noticeably: customers who bought in the last six months, customers within a few kilometres of the store, customers who bought the category on offer.
A customer who bought a saree last Diwali being told about the new collection is a relevant call. The same call to someone who bought a phone charger is spam, and they will treat it accordingly — including on the next call, which might have been relevant.
When to use a two-way call instead
Whenever the answer matters. "Your pre-booked item is in stock — would you like us to hold it?" is worth ₹4–5 a minute because the reply is the point.
Pure broadcast is for messages where you want reach and nothing else. The full comparison is here, and it is the single decision that determines what a calling programme costs.