Bulk SMS that gets
Delivered.✓✓
DLT-compliant bulk SMS, WhatsApp Business API and voice messaging for Indian businesses. Direct operator routes, pricing written down in full, and a real person on WhatsApp when something needs fixing.
Trusted across industries — see your use case →
Every channel. One platform.
From promotional blasts to mission-critical OTPs — we run the full communication stack for modern Indian businesses.
Promotional SMS
Mass campaigns with rich sender IDs and real-time delivery reports.
Learn more → 02OTP SMS
95% accuracy. Sub-second routing through dedicated priority lanes.
Learn more → 03Transactional SMS
Order alerts, bank notifications. DND-compliant, always on.
Learn more → 04International SMS
Global reach across 190+ countries with competitive pricing.
Learn more → 05Voice SMS
Pre-recorded voice broadcasts for announcements at scale.
Learn more → 06IVR Solutions
Intelligent call routing. Available 24/7 without extra headcount.
Learn more → 07WhatsApp API
Official Business API. Rich media, quick replies, flows & catalogues.
Learn more → 08Missed Call
Frictionless lead generation. Zero cost for your end users.
Learn more →Infrastructure built for scale.
Parallel routing across Airtel, Vodafone & BSNL gateways. Nothing degrades when you push a million messages at once.
SMS in one click.
Campaigns fan out across direct telco routes simultaneously. Real-time route health, automatic failover, zero babysitting.
REST + SMPP. One hour to integrate.
SDKs for PHP, Java, Python & Node. Clear docs, rock-solid endpoint, ultra-high throughput for enterprise use.
# send an OTP curl -X POST api.whybulksms.com/v1/send \ -H "Authorization: Bearer $KEY" \ -d "to=9198XXXXXXXX" \ -d "sender=WBSOTP" \ -d "text=Your OTP is 4471"
Every click, attributed.
Shorten, track and attribute each link. Conversion funnels in real time.
Your brand. Our pipes.
White-label sub-accounts, margin controls and billing — all under your own domain.
DLT-ready. DND-safe.
Approved headers, templates and scrubbing built in.
From first message to first campaign.
Tell us what you need
Message us on WhatsApp. We set up your account with free test credits so you can check delivery first.
Register sender ID & templates
We handle DLT header and template approval with the operators for you.
Upload & send
Excel upload, dashboard composer or API. Watch delivery reports come in live.
Simple plans. No surprises.
Unlimited validity on every plan. Credits never expire.
- Promotional route
- API access included
- Excel bulk upload
- 24×7 support
- Standard route
- 6-alphabet sender ID
- API access + campaign analytics
- 24×7 priority support
- Premium route
- SMPP connectivity
- Dedicated account manager
- SLA guarantee
Need volume rates, voice or WhatsApp API pricing? See the full price list →
Loved by teams that can't afford downtime.
Switched from two other providers. OTP delivery is near-instant and uptime is genuinely impressive. Our checkout auth failures dropped 60%.
The reseller panel is clean, margins are good, and support actually responds. Running 30+ client accounts through it with zero issues.
API integration took under an hour. Docs are clear, endpoint is rock-solid, and the team helped us configure SMPP for high volume.
Bulk SMS in India, answered.
What is bulk SMS and how does it work in India?
Bulk SMS lets you send one message to thousands of mobile numbers at once through a telecom gateway instead of a handset. You upload an Excel list or call our API, the message is matched against your registered DLT template, routed to Airtel, Jio, Vi or BSNL, and a delivery report comes back per number. In India every commercial SMS must carry a registered sender ID (header) and template under TRAI's DLT rules, which we help you set up free of charge.
Do I need DLT registration before sending bulk SMS?
Yes. Since TRAI's DLT mandate, every business sending commercial SMS in India must register as a Principal Entity on an operator DLT portal, then register its sender ID and message templates. Without it the operator blocks the message. Our team files your header and templates with you and usually gets approval in 24 to 72 hours.
What is the difference between transactional, OTP and promotional SMS?
Transactional SMS carries service information to your own customers - order updates, payment alerts, appointment reminders - and reaches DND numbers 24x7. OTP SMS is a dedicated high-priority lane for one-time passwords and login codes. Promotional SMS carries offers and marketing, is sent only to non-DND numbers, and is allowed between 9 AM and 9 PM as per TRAI norms.
How fast is delivery and what uptime do you offer?
OTP traffic typically lands in under 5 seconds on our priority lane. Transactional traffic is delivered in seconds and campaigns are load-balanced across multiple operator binds. We run the platform to a 99.9% uptime target with 24x7 monitoring on critical routes.
Can I send bulk SMS in Hindi and other Indian languages?
Yes. We support Unicode so you can send in Hindi, Marathi, Gujarati, Tamil, Telugu, Kannada, Bengali, Punjabi, Malayalam and Odia. A Unicode SMS counts 70 characters per credit instead of 160, which we show you before the campaign goes out.
Is there a free trial and what does it cost to start?
Yes - we open a test account with free credits so you can check delivery on your own numbers before paying. There is no setup fee on SMS plans and credits are valid for one year. WhatsApp us on +91 99819 10356 or send the enquiry form and we will set it up the same day.
Tell us what you need. We reply the same day.
Send your requirement and our team will set up a free test account with live credits, help you file your DLT header and templates, and share a written quote.