Effective July 3, 2025, businesses sending A2P (Application-to-Person) SMS messages to Irish mobile numbers must comply with the new SMS Sender ID Registry rules mandated by the Commission for Communications Regulation (ComReg).
This guide outlines who is affected, what changes are coming, and how Omnisend can help.
ComReg has created an official SMS Sender ID Registry to protect the A2P SMS channel from scams that could harm consumers and organizations.
Key updates:
Only registered Sender IDs can be used for A2P SMS to Irish mobile numbers.
From July 3, 2025: Unregistered Sender IDs will be labeled “Likely Scam”.
From October 3, 2025: Unregistered Sender IDs will be blocked entirely.
Sender IDs must be registered via ComReg’s Sender Registry Portal, accessible only to Participating Aggregators (PAs) or Originating Participating Aggregators (OPAs).
Who Is Affected?
You are affected if you send A2P SMS messages to Irish mobile numbers and use a Sender ID. This includes:
Promotional campaigns
Transactional messages
Automated notifications
Any branded SMS sent through Omnisend
Action Steps for Compliance
Here’s a checklist to get your Sender ID compliant with ComReg’s requirements:
Step | What to Do |
1️⃣ Access the Registration Portal | |
2️⃣ Select the Correct Application Type | Choose “I’m applying to be a Sender ID Owner.” Fill in your organization details (type, phone, email, website, trademark number if applicable, tax number, CRO number if applicable). |
3️⃣ No CRO Number? | Tick “I don’t have a CRO Number.” Upload acceptable proof of business legitimacy (e.g., incorporation certificate, trademark certificate, charity registration, Irish premises proof, tax number, or similar documentation). |
4️⃣ Request Your Sender ID | Once approved, add your Sender ID in the portal. If registering more than one, click “Add Another Sender ID.” |
5️⃣ Assign Vertex LV and TWILIO as your OPA, and add Omnisend as your Third Party | In the portal, go to Sender IDs → “OPA Authorisation” → Search for SIA “Vertex LV” → Confirm. Repeat the same steps to add Twilio. In the Third Parties list, make sure to add Omnisend. |
6️⃣ Completion | After assigning Vertex LV and Twilio, Omnisend will register your Sender ID with Irish mobile operators. |
How Omnisend Supports Compliance
Omnisend works with Vertex LV and Twilio as the OPA to ensure your registered Sender ID is recognized by Irish mobile networks. Once you complete registration, assign Vertex LV and Twilio, and add Omnisend as a Third Party, we handle the operator-level setup so your messages are delivered successfully.
Takeaway
Starting July 3, 2025, ComReg will label messages from unregistered Sender IDs as “Likely Scam.”
Starting October 3, 2025, such messages will be blocked.
To avoid disruption and protect your sender's reputation:
Register your Sender ID via ComReg’s portal
Assign Vertex LV and Twilio as your OPA
Add Omnisend in the Third Parties List
Ensure all Irish SMS campaigns use a compliant Sender ID
For exact steps on how to register and assign your Sender ID, refer to ComReg Registry Q&A.