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Quick answer: An SMS blast is a bulk SMS campaign that sends the same message to your entire contact list at once — used for promotions, alerts, OTPs, and reminders. A legitimate SMS blast in India goes out through a DLT-registered Sender ID with a TRAI-approved template to consented recipients; anything that doesn't match those records gets blocked before it reaches a handset. MetaReach runs SMS blasts at a flat ₹0.12/SMS with free DLT registration completed in 4 hours.
"SMS blast" gets searched constantly, but very few pages actually explain what it is, whether it's legal, and how it's different from the spam tools that share the same name. That confusion costs businesses time — some hesitate to run a blast because they've seen the term next to "SMS bomber" and assume there's a compliance risk; others run one without DLT registration and watch their delivery reports come back empty. This guide covers both: what an SMS blast actually is, how it's different from SMS bombing, and the exact steps to send one that's fully compliant with TRAI's regulations.
MetaReach has handled DLT registration and compliant SMS delivery for Indian businesses since 2016, which is the same infrastructure that makes SMS blasts work correctly — a registered entity, an approved Sender ID, and a pre-approved message template, all checked automatically before a single message leaves the gateway.
An SMS blast is the practice of sending one message to a large number of recipients at the same time, rather than one at a time or on a staggered schedule. The message is identical for everyone on the list — a promotional offer, a service alert, a one-time password, or an event reminder — and it goes out in a single send instead of trickling out over hours or days.
Businesses reach for an SMS blast when timing matters more than personalization: a flash sale that needs everyone to know at once, a service outage notice, an OTP that has to arrive in seconds, or an appointment reminder that goes out to an entire day's patient list in one pass. SMS still gets opened faster than almost any other channel — most people glance at a text within minutes of it landing, whether or not they have an app installed or data connectivity — which is exactly why time-sensitive alerts and OTPs are still sent by SMS even in an app-first market.
Common SMS blast use cases include:
Three terms get used around bulk texting, and only two of them describe something MetaReach helps with. Here's the distinction, stated plainly:
The broad term for sending SMS at scale through a business account — includes blasts, drip campaigns, and triggered transactional alerts sent over any timeframe.
A bulk SMS campaign sent to a full list instantly, in one go, from a DLT-registered Sender ID with a TRAI-approved template, to consented recipients.
An abuse tool that repeatedly submits one phone number to OTP or signup forms to flood it with messages. No registered sender, no consent, no legitimate business use — not a service MetaReach provides or supports.
The confusion is understandable — both terms describe a phone receiving many SMS messages in a short window, and neither is a phrase most people encounter outside a search bar. The difference isn't the volume, it's the ownership and consent behind it. A business running an SMS blast owns a registered Sender ID, has a TRAI-approved template on file for exactly that message, and can point to a consent record for every recipient on the list. Whoever triggers an SMS bombing attack owns none of that — they're exploiting someone else's OTP or signup form to target a number that never agreed to receive anything. One is a billed, auditable marketing or alert channel; the other is a form of harassment that telecom operators and platforms actively work to block. MetaReach's DLT-gated sending pipeline is built around the first definition only, which is also why it can't be misused for the second.
Yes. Sending an SMS blast is completely legal in India when it's sent through a DLT-registered Sender ID with a TRAI-approved template, to recipients who've given consent to be contacted. That combination — registered entity, registered Sender ID, approved template, documented consent — is what TRAI's Telecom Commercial Communications Customer Preference Regulations require of every commercial sender in the country.
TRAI's rules don't stop a business from sending an SMS blast — they stop unregistered ones from being delivered. Every commercial SMS in India is checked against the DLT platform before it reaches a handset; if the sender, template, or consent record doesn't match what's on file, telecom operators block the message at the network level rather than it landing and being reported as spam. There's no ambiguity to navigate here — non-compliant traffic simply doesn't get delivered, which is exactly why DLT registration is the first step in every SMS blast, not an optional add-on. You can read the regulations directly on the TRAI official portal.
Consent is the other half of the legal picture, and it's tracked separately from the DLT template check. A recipient's number needs a documented opt-in before a promotional SMS blast can legally reach it — collected through a website form, an in-store signup sheet, a checkbox at checkout, or an SMS keyword reply. Transactional and OTP blasts sit in a different category: because they're tied to a service the customer already requested (an order, a login, an appointment), they're exempt from the promotional consent and time-window rules, though the Sender ID and template still have to be DLT-registered like any other commercial SMS.
New-launch announcements and price-drop alerts sent to an entire lead list at once. See Bulk SMS for Real Estate.
Flash-sale and stock-drop blasts timed to reach every subscriber before a competitor. See E-commerce Communication Solutions.
Admission-window and exam-date alerts sent to an entire parent or student list simultaneously. See Bulk SMS for Educational Institutions.
Same-day appointment reminders blasted to a full clinic schedule to cut no-shows. See Patient Appointment Reminders.
MetaReach charges a flat ₹0.12/SMS for an SMS blast — the same rate whether the campaign is promotional, transactional, or OTP-based, with no setup fee and no tiered pricing that rises as your list grows. A blast to 1,000 contacts and a blast to 1,00,000 contacts are both billed at the same per-message rate. See the full ₹0.12/SMS flat pricing breakdown, including volume examples and DLT cost details.
A quick way to size a campaign: a blast to a 10,000-contact list costs ₹1,200 at the flat rate, and a blast to 50,000 contacts costs ₹6,000 — with DLT registration handled free, that per-message rate is the only cost in the campaign. New accounts can test the full flow, from list upload to delivery report, with a 99-SMS free trial before committing budget to a larger send.
Common questions before sending your first SMS blast.
Bulk SMS is the umbrella term for sending any volume of SMS through a business account — it covers drip campaigns, triggered transactional alerts, and sends staggered over days. An SMS blast is a specific type of bulk SMS campaign where the entire list receives the same message in one go, sent all at once rather than staggered. Every SMS blast is a bulk SMS campaign, but not every bulk SMS campaign is a blast — a single OTP sent as someone logs in is bulk SMS infrastructure, not a blast.
No — they are unrelated, even though search results sometimes blur the two together. An SMS blast is a legitimate marketing or alert campaign sent from a DLT-registered Sender ID to consented recipients, with every message trackable and billed. SMS bombing is an abuse technique that repeatedly submits one phone number to OTP or signup forms to flood it with unwanted messages — it has no registered sender, no consent, and no legitimate business purpose. MetaReach only sends compliant SMS blasts and does not support or facilitate SMS bombing in any form.
MetaReach charges a flat ₹0.12 per SMS for an SMS blast, whether the campaign is promotional, transactional, or OTP-based — there's no setup fee and no tiered pricing that rises per message as your list grows. A 100,000-contact blast costs the same ₹0.12/SMS as a 1,000-contact one.
Yes. TRAI requires every commercial sender in India — entity, Sender ID, and message template — to be registered on the DLT platform before an SMS blast can be delivered; anything that doesn't match a registered template is blocked at the network level before it reaches a handset. MetaReach handles the entire DLT registration process free of charge, typically completing entity, Sender ID, and template approval within 4 hours.
Once your Sender ID and templates are DLT-registered, an SMS blast goes out immediately after you hit send — MetaReach pushes the full list into telecom operator SMSCs in one push, with delivery reports updating in real time from your dashboard or API. If this is your first campaign and DLT registration isn't done yet, budget up to 4 hours for that one-time setup; every blast after that launches instantly.
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