Short answer: use a missed call number when you only need to know who is interested, a toll-free number when the customer needs to talk to you now, and an SMS short code when the customer needs to send you text (a keyword, a code, a PIN). They are not substitutes; they capture different things.
The Three Options Side by Side
| Missed call number | Toll-free number (1800) | SMS short code / long code | |
|---|---|---|---|
| What the customer does | Dials, call is cut | Dials, talks | Types a keyword and sends |
| Who pays per interaction | Nobody per minute | Business pays per minute | Customer usually pays SMS cost |
| What you capture | Number + time | Conversation (+ number) | Number + text |
| Staff needed to answer | No | Yes, or an IVR | No |
| Works on basic phones | Yes | Yes | Yes, if they can type |
| Needs literacy | No | No | Yes |
| Works in any language | Yes | Depends on who answers | Depends on keyword language |
| Attribution per ad | Number per ad | Number per ad (costly) | Keyword per ad |
| Cost grows with volume | Slightly (per event) | Strongly (minutes) | Depends on provider |
| Data in real time | Webhook / CSV | Call logs | Provider dashboard / API |
Missed Call Number
What it is: a number that rejects every call with a busy tone. The caller pays nothing and you get their number and the time. See what is a missed call service.
Strengths
- Lowest possible effort for the customer.
- Language-neutral: no app, no internet, no typing, any phone.
- No staff needed at the moment of response.
- Cheap per lead, and predictable on an unlimited plan.
- One number per ad gives clean offline attribution.
Limits
- You get only a phone number and time. Anything else needs a callback.
- Every call is an event; repeat callers need de-duplication.
- Each number has a cap on simultaneous calls, so bursts need several numbers.
Typical cost on Edesy: ₹499/month per number + ₹0.30 per event delivered to a webhook (log and CSV free without one), or ₹1,498/month Unlimited. Plus GST. See the pricing page.
Toll-Free Number
What it is: a number the caller dials free, while the business pays for every inbound minute. See toll-free numbers.
Strengths
- The customer can talk to you immediately.
- Signals national scale and removes every barrier to calling.
- Right for support, helplines, recalls and complex sales.
Limits
- Somebody, or an IVR, has to answer.
- Your bill grows with every successful campaign.
- Overkill if all you need is a callback list.
SMS Short Code or Keyword Number
What it is: customers send a keyword ("SAMPLE 411001") to a short or long code, and you receive the sender's number and message.
Strengths
- Captures text: a code from a pack, a PIN code, a choice.
- Can trigger an automatic reply with a coupon or confirmation.
Limits
- Requires typing, which loses low-literacy and older audiences.
- The customer may pay for the SMS.
- Keyword errors and spelling variants need handling.
- Commercial SMS in India comes with registration and template rules.
Edesy does not offer SMS short codes self-serve. If you want an SMS reply to people who give a missed call, that is available on request; we set it up for your account quickly.
Which One for Which Campaign
| Campaign | Best fit | Why |
|---|---|---|
| Newspaper / hoarding lead capture | Missed call | Lowest friction, number per ad |
| TV or radio poll | Missed call, several numbers | One number per option, no typing |
| Customer support line | Toll-free or local virtual number | Customer needs to talk |
| On-pack unique code redemption | SMS | Needs the code as text |
| On-pack interest or registration | Missed call | Number is enough |
| Rural or low-literacy audience | Missed call | No reading or typing |
| Product recall or safety helpline | Toll-free | Zero friction, real conversation |
| Callback request ("we'll call you") | Missed call | You call back anyway |
| Event RSVP | Missed call | Unique callers = RSVPs |
| Survey with several answers | Missed call (number per answer) or SMS | Depends on how many options |
| High-value B2B enquiry | Local virtual number | Buyers expect to speak |
Cost Comparison, Roughly
Exact toll-free and SMS pricing varies by provider and contract, so check current pricing with each. The structure is what matters:
| Volume pattern | Missed call | Toll-free | SMS |
|---|---|---|---|
| 1,000 responses/month | Rental + small per-event | Rental + every minute answered | Per-message or pack |
| 10,000 responses/month | Unlimited is predictable | Minutes and staff scale up | Pack or volume price |
| Burst of thousands in an hour | Several numbers, no staff | Needs staff or IVR capacity | Throughput depends on provider |
A missed call number is the only one of the three where neither side pays per minute and nobody has to answer.
Combining Them
The strongest setups use more than one:
- Missed call + local number: "Give a missed call for a callback, or call 0XX-XXXXXXX to talk now." The virtual phone number handles conversations; the missed call number collects quiet interest.
- Missed call + toll-free: national brands keep toll-free for support and run missed call numbers per campaign for attribution.
- Missed call + SMS reply: the missed call captures the number; an SMS confirms or delivers a code (on request on Edesy).
- Missed call + CRM: every caller lands in Edesy CRM as a lead for the sales team.
For the wider question of which phone line a business needs, see virtual number vs toll-free vs second SIM.
Mistakes to Avoid
- Using toll-free as a lead-capture line. You pay for minutes of conversations that a callback would handle more cheaply, and someone has to answer every call live.
- Using a missed call where you need text. If the offer depends on a code printed inside the pack, a missed call cannot carry it; use SMS or a callback that asks for it.
- One number for every channel. Whichever option you pick, separate numbers or keywords per channel are what make attribution possible.
- No follow-up plan. All three capture a moment of interest; only a fast follow-up converts it.
Decision in Three Questions
- Does the customer need to talk to you right now? Yes: toll-free or a local virtual number.
- Does the customer need to send you text? Yes: SMS.
- Otherwise: a missed call number, with fast follow-up.
Get a Missed Call Number or read more on the missed call service page.