An SMS gateway for Sri Lanka needs a registered alphanumeric sender ID: since 29 July 2026, messages with unregistered sender IDs to Dialog and Hutch are blocked, and SLT-Mobitel accepts only OTP and transactional traffic. Pick a provider that can register your sender ID on each network and route to all three operators directly or through stable partners.
Rules last checked: October 2026.
How does A2P SMS work in Sri Lanka?
A2P SMS to Sri Lanka goes from your platform to an SMS gateway or aggregator, then to the mobile operators. The market has three mobile networks:
- Dialog, the largest operator, which absorbed Airtel Lanka in 2024 (the Airtel brand continues under Dialog).
- SLT-Mobitel, the mobile arm of Sri Lanka Telecom.
- Hutch, which merged with Etisalat Sri Lanka (some provider guides still list the network as Etisalat).
The sector regulator is the Telecommunications Regulatory Commission of Sri Lanka (TRCSL). In practice, sender ID rules and traffic filtering are applied by the operators, so what matters most is how your provider connects to each network. Our guide to what an SMS gateway is covers the basic chain.
Is sender ID registration required in Sri Lanka?
Yes. Sender ID registration is required for Dialog and Hutch, and from 29 July 2026 those networks block messages from unregistered sender IDs. Registration is done through your SMS provider and typically takes around three weeks. What you usually need:
- The sender ID itself, 3 to 11 characters, normally your brand name.
- Your company name and whether you are a local or international company.
- Sample message content. Generic content is not accepted: messages should name the brand.
- For domestic traffic, a letter of authorization on company letterhead, signed and stamped by an authorised signatory.
Dynamic alphanumeric sender IDs and long numbers are not supported, and dynamic numeric senders may be overwritten. Register separately for international and domestic traffic if you send both, because they are often priced and approved as different routes. See sender ID registration for how these regimes work across countries, and sender ID types for the alphanumeric vs numeric difference.
Which traffic types are allowed?
| Network | Sender ID | Traffic accepted |
|---|---|---|
| Dialog | Registration required, unregistered IDs blocked | No traffic-type limit reported by providers, but the sender ID must be registered |
| Hutch | Registration required, unregistered IDs blocked | No traffic-type limit reported by providers, but the sender ID must be registered |
| SLT-Mobitel | Alphanumeric supported | Only OTP and transactional (banking, payments); other traffic is blocked |
The Mobitel restriction matters for marketing senders: a promotional campaign will not reach Mobitel subscribers on standard A2P routes even with a registered sender ID. Split your traffic by type, as explained in transactional vs promotional SMS. Two-way SMS and number portability lookups are not supported on these routes.
What are the rules for promotional SMS?
TRCSL has directed mobile operators to give subscribers a free way to opt out of unsolicited promotional SMS. Include your brand name and a clear opt-out in every marketing message, and send only to people who agreed to receive them. The Personal Data Protection Act No. 9 of 2022 adds consent and data handling duties; under a July 2026 gazette notice its core obligations apply from 1 January 2027. If you send OTPs, follow OTP SMS best practices so codes are short, branded and free of links.
How to choose an SMS gateway for Sri Lanka
Ask each provider these questions before sending volume:
- Which of the three networks do you reach directly, and which through partners?
- Can you register my sender ID on Dialog and Hutch, and how long does it take?
- Do you price international and local traffic separately, and which one applies to me?
- Do delivery reports come from the operator, or are they generated by the gateway?
Routes that promise delivery with any sender ID and no registration are almost always grey, and after July 2026 they also risk outright blocking. Read grey SMS routes and their risks and how to test an SMS route before committing.
Getting a Sri Lanka SMS route
VoIPMatcher sources A2P SMS routes from its carriers and manages them for you, including the sender ID setup per network. See the Sri Lanka SMS destination page for open demand, then request a Sri Lanka SMS route with your sender ID, traffic type and monthly volume.
Frequently asked questions
What is the best SMS gateway in Sri Lanka?
There is no single best gateway for every sender. Compare providers on whether they have direct or stable connections to Dialog, SLT-Mobitel and Hutch, whether they can register your sender ID on each network, delivery reports per operator, and the price per message for your traffic type. Test with real messages to each network before you send volume.
Is there a free SMS gateway in Sri Lanka?
Free gateways are not suitable for business messaging. Mobile operators charge for every A2P message they deliver, so any free service either limits volume heavily, sends through unregistered or grey routes, or shows ads. For OTPs and alerts you need a paid route with a registered sender ID, or messages will be blocked.
Can I send SMS to Sri Lanka with a phone number as sender?
Long numbers are generally not supported as sender IDs for A2P traffic to Sri Lanka, and dynamic numeric senders may be overwritten by the network. Use a registered alphanumeric sender ID with your brand name. Two-way SMS on standard A2P routes is not supported either.
Does Sri Lanka have a data protection law for SMS marketing?
Yes. The Personal Data Protection Act No. 9 of 2022 applies to the processing of personal data, including phone numbers used for marketing. Its core obligations for controllers and processors take effect on 1 January 2027 under a 2026 gazette notice. Collect consent and keep opt-out records before then.
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