Bulk SMS·7 min read

How to Choose a Bulk SMS Service Provider in India (2024 Guide)

There are hundreds of bulk SMS providers in India. Most look identical on their websites. Here are the six things that actually separate a reliable platform from one that will cause you headaches — before you commit to a plan.

Arjun Mehta

Head of Product — ConnexBetter

6 Things to Check Before Choosing a Bulk SMS Provider

TRAI DLT compliance — non-negotiable

Every legitimate bulk SMS provider in India must operate as a TRAI-registered telecom aggregator. Before anything else, verify: • They are listed as an approved aggregator on the TRAI website • They assist with DLT entity and template registration • Their API accepts dlt_te_id (DLT template ID) in message parameters Any provider offering SMS without DLT compliance is operating illegally and puts your brand at risk of message blocking.

Delivery rate and route quality

Ask for a test: send 100 messages to your own numbers across Jio, Airtel, Vi, and BSNL. Measure delivery time and receipt. Good benchmarks: • Transactional SMS: delivered in under 5 seconds, 99%+ success • Promotional SMS: delivered within 30 seconds, 87%+ to non-DND numbers Providers using premium direct operator connections deliver faster than those routing through multiple aggregators.

API quality and documentation

If you plan to integrate SMS into your app, CRM, or website, evaluate: • Is the REST API well-documented with code examples in your language? • Does it support webhooks for delivery receipts? • Is there an SMPP option for very high volume (10,000+ SMS/day)? • What is the API uptime SLA? Poor API documentation is a red flag — it usually means the platform is designed for manual use, not developer integration.

Pricing transparency

Watch for hidden costs: • Per-SMS rate: the headline price (₹0.10–₹0.18) • Setup fee: some charge ₹2,000–₹5,000 to activate an account • DLT fees: your provider should pass through TRAI's actual DLT registration cost (₹5,900/year for entity + ₹590/sender ID) without a markup • Monthly minimums: some plans require ₹500–₹2,000/month minimum spend Ask for a written quote that itemises all costs before signing up.

Support and uptime SLA

SMS is often mission-critical (OTP for login, transaction alerts). Before choosing a provider: • What is their uptime SLA? (Look for 99.9%) • Do they have 24/7 support or only business hours? • Is there a dedicated account manager for enterprise plans? • What is their incident response time? Test their support before buying — send a pre-sales query and measure response speed.

Sender ID and template support

Your 6-character sender ID (e.g., CNXBTR) and message templates must be registered on TRAI's DLT portal. A good provider: • Assists with DLT registration as part of onboarding • Supports custom sender IDs (not just shared ones) • Allows unlimited template registrations • Provides a dashboard to manage templates and check approval status

Pre-Signup Checklist

Provider is a TRAI-registered telecom aggregator

DLT registration assistance included in onboarding

API documentation available with code examples

Delivery webhook (real-time receipt confirmation) supported

Uptime SLA of 99.9% or above in writing

No grey routes — direct operator connections only

Custom sender ID (6-character header) supported

24/7 support or at minimum same-day response SLA

Pricing quote includes all fees (no hidden charges)

Free trial or test credits before purchase

Frequently Asked Questions

What is the cheapest bulk SMS rate in India?

Promotional bulk SMS starts at ₹0.10–₹0.12 per SMS with established providers. Transactional SMS (for OTP and alerts) costs ₹0.12–₹0.18 per SMS due to higher-priority routes. Be cautious of rates below ₹0.08 — these often use grey routes (unregistered) that violate TRAI rules and result in poor delivery or regulatory action.

Is DLT registration the provider's responsibility or mine?

DLT entity registration is your responsibility as the brand sending SMS — the sender ID and templates must be registered under your company's name and PAN. However, a good bulk SMS provider will guide you through the process and submit on your behalf. ConnexBetter's onboarding team handles the full DLT registration process for new customers.

What delivery rate should I expect from a bulk SMS provider?

For promotional SMS to non-DND numbers, expect 85–92% delivery rates (DND filters and operator blocks reduce this). For transactional SMS (OTP, alerts) on high-priority routes, expect 97–99.5% delivery rates. Ask your provider for a 30-day delivery report sample before committing to a large volume purchase.

What is a grey route SMS and why should I avoid it?

Grey routes are unauthorized paths that bypass TRAI's DLT system — often using international SIM cards or unregistered sender IDs. Messages sent via grey routes are cheaper but violate Indian telecom law, are subject to blocking by operators, expose your brand to regulatory risk, and cannot be tracked reliably. Only use TRAI-registered routes.

Can I switch bulk SMS providers without losing my sender ID?

Yes. Your DLT-registered sender ID and templates belong to your company, not your provider. You can migrate to a new provider and continue using the same sender ID. However, your new provider must be a registered telecom aggregator who can connect your DLT-approved sender ID to their platform.

ConnexBetter checks every box

TRAI-registered aggregator · DLT onboarding included · 99.9% uptime · REST + SMPP API · 24/7 support · Free trial

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Bulk SMS Service SMS Gateway India DLT Registration Guide Transactional SMS API SMS API Docs