Allotropic SMS
Send bulk SMS from a spreadsheet or through our API. Use your TCRA-approved sender ID and track message delivery in one place.
SMS services
Explore our 9 specialized messaging services with direct carrier connections and automated failure refunds.
Bulk SMS Gateway & Messaging API
Enterprise bulk SMS delivery engine reaching over 200 networks worldwide with direct Tier-1 telecom routes in Tanzania and East Africa.
OTP & 2FA SMS Verification API
Lightning-fast, ultra-low latency SMS delivery lane specifically optimized for login authentication, one-time passwords, and multi-factor security.
Transactional SMS & Banking Alerts
Reliable notification infrastructure for financial transactions, billing statements, fraud warnings, and mission-critical order status updates.
Excel & Spreadsheet Bulk SMS Dispatcher
Zero-code campaign launcher. Upload your .xlsx, .csv, or .txt contact files and dispatch personalized bulk SMS campaigns in minutes.
Branded Alphanumeric Sender IDs (TCRA Compliant)
Deliver SMS under your official brand name instead of an unknown number, fully registered and certified with TCRA regulations in Tanzania.
Promotional & Marketing SMS Broadcasts
Drive customer conversions, flash sales, event announcements, and retail customer engagement with high-impact mass SMS blasts.
Multi-Network Tanzanian & East African Telecom Routing
Intelligent dynamic carrier routing across Vodacom, Airtel, Tigo, Halotel, Safaricom, and MTN with automated congestion bypass.
Two-Way SMS & Inbound Webhooks
Build interactive customer conversations, survey feedback loops, and customer support channels with two-way SMS and inbound webhooks.
Enterprise Scheduled SMS & DND Campaign Management
Sophisticated calendar dispatching, recurring reminders, time-zone rate throttling, and automated regulatory compliance tools.
Excel & File Uploads
Send to thousands from .xlsx, .csv or .txt; with personalised text and dynamic column variables per row.
TCRA Branded Sender IDs
Messages arrive proudly displaying your verified company name, certified with TCRA guidelines across all carriers.
Live Real-Time Reports
Every message tracked with operator receipts. Filter, drill down and export in one click.
Developer REST API
Clean, developer-first REST API with bearer API keys, idempotency keys, and instant status webhooks.
Built for Enterprise Volume
Batched dispatch, automated multi-carrier failover routing, and precision scheduled campaigns.
Pay For What Lands
Credits for messages that fail permanently due to invalid numbers are automatically refunded to your balance.
SMS API
Integrate OTPs, security alerts and transactional notifications into your application in minutes. Includes support for idempotency keys, status webhooks, and automatic retries.
curl -X POST https://sms.allotropicltd.com/api/public/v1/sms/send \
-H "Authorization: Bearer alt_live_..." \
-H "Content-Type: application/json" \
-H "Idempotency-Key: auth-step-4021" \
-d '{
"sender_id": "MYBRAND",
"to": "255712345678",
"message": "Your verification code is 4821"
}'Frequently Asked Questions
Direct answers on bulk SMS delivery, TCRA compliance, and API integration in Tanzania.
Q1.What is Allotropic SMS?
Allotropic SMS is an enterprise-grade cloud messaging platform and developer REST API based in Dar es Salaam, Tanzania. We provide reliable bulk SMS, instant 2FA OTP delivery, branded sender ID registration with TCRA, and Excel spreadsheet messaging across all Tanzanian telecommunications networks (Vodacom, Tigo, Airtel, Halotel) and over 200 global carriers.
Q2.How do I send bulk SMS in Tanzania and East Africa?
You can send bulk SMS in two simple ways: 1) Upload an Excel, CSV, or text spreadsheet with recipient phone numbers and send directly through our web portal with personalized variables. 2) Integrate our developer REST API using your secret API key with simple JSON payloads in Python, Node.js, PHP, or cURL.
Q3.Which telecommunications networks in Tanzania are supported?
Allotropic SMS is directly connected to all licensed Tanzanian mobile network operators: Vodacom Tanzania, Tigo Tanzania, Airtel Tanzania, Halotel, and TTCL. We also provide direct cross-border routing to Safaricom in Kenya, MTN in Uganda, and regional carriers across East Africa.
Q4.How do I register an official branded Sender ID with TCRA?
To send messages displaying your company name (such as YOURBRAND) instead of a random phone number, submit your business registration certificate (BRELA), TIN certificate, and an authorization letter via your Allotropic SMS dashboard. Our compliance team coordinates official approval with TCRA and mobile network operators within 24 to 72 hours.
Q5.How does the Allotropic SMS credit billing and refund policy work?
Allotropic operates on an atomic, auditable credit model. You purchase SMS credits in Tanzanian Shillings (TZS) or US Dollars (USD). Under our pay-for-what-lands policy, if a message fails permanently due to an invalid destination number or persistent carrier error, the credits deducted are automatically refunded back to your account balance.
Q6.Can I send bulk SMS from an Excel spreadsheet?
Yes. Our platform allows you to drag-and-drop .xlsx, .xls, and .csv files. You can use dynamic merge tags such as {name}, {balance}, or {due_date} matching the columns in your spreadsheet to personalize each SMS automatically.
Q7.What is the delivery latency for 2FA OTP verification codes?
Authentication and OTP codes are prioritized on express Tier-1 telecommunication routes, delivering to user handsets within 1 to 2 seconds across Tanzania and East Africa.
Q8.Does Allotropic SMS offer a developer REST API?
Yes. We offer a developer-first JSON REST API with Bearer token authentication, idempotency keys, scheduled delivery parameters, and webhook delivery callbacks. Comprehensive documentation, OpenAPI references, and code samples are available at /docs.
Dar es Salaam Headquarters
Mbezi Beach Shule, Dar es Salaam, Tanzania. Incorporated in Tanzania.
Direct Support Hotline
Call: +255 723 313 356 • Email: hello@allotropicltd.com
East Africa Service Area
Tanzania (Vodacom, Tigo, Airtel, Halotel), Kenya (Safaricom), Uganda (MTN), Rwanda.