Introducing Wireless Blocklists

Telnyx has launched Wireless Blocklists, giving you precise control over where your SIMs connect, by country or by carrier. This feature helps you align connectivity with your organization’s security, compliance, and cost-management policies, ensuring every SIM operates only in approved regions and networks worldwide.

Built for granular control, Wireless Blocklists let enterprises define and manage connection permissions via API, making it easy to restrict SIM activity to preferred locations and carriers across global deployments.

Precision Connectivity Management

Wireless Blocklists let you block entire countries or individual mobile operators using standardized identifiers:

• Country (MCC or Country Name): Restrict SIM connectivity based on Mobile Country Codes or ISO country names.
• Carrier (PLMN): Block specific operators using Public Land Mobile Network identifiers.

You can create, modify, and delete these blocklists, apply them to SIM groups, and view active restrictions directly within SIM group information, all via API.

How It Works

When a SIM attempts to attach to a network, Telnyx checks the connection request against your active blocklists:

• If the MCC or PLMN matches a blocked entry, the SIM’s connection attempt is denied.

• These blocked attempts are logged and viewable in your connectivity logs within the Mission Control Portal, giving you full visibility into when and where restrictions are applied.

Key Benefits

• Prevent High-Cost Roaming Block SIM connectivity in regions with expensive roaming rates and control spend at scale.

• Increase Security and Compliance Limit where devices can connect to prevent unauthorized or non-compliant usage.

• Granular Carrier Control Apply restrictions at the carrier level using PLMN identifiers for precise network management.

• Full API Control Create, manage, and apply blocklists programmatically for large-scale or automated deployments.

• Real-Time Visibility Track and audit blocked attempts directly in the Mission Control Portal.

Network Compatibility

Due to 3G network architecture constraints, when applying any blocklist to a SIM, 3G data services are disabled across the footprint.

• 4G/LTE services remain unaffected and continue to support granular country and carrier blocking.
• For deployments requiring both blocklist functionality and 3G connectivity, configure devices to prioritize LTE/4G networks.

This design aligns with the global sunset of 3G networks and reflects current industry and infrastructure standards.

Getting Started

Sign up or log in to your Telnyx Mission Control Portal account and follow the steps:

1. Retrieve supported values — Use the API to fetch the list of supported countries, MCCs, or PLMNs available for blocklisting.
2. Create a blocklist — Define your country-, MCC-, or PLMN-based restrictions through the API.
3. Apply to SIM groups — Assign a blocklist to specific SIM card groups to control where they can connect.
4. Monitor connectivity — Review connection logs to track and analyze any blocked connection attempts.
5. Update as needed — Modify existing blocklists or create new ones as your connectivity requirements evolve.
6. One blocklist per group — While multiple blocklists can exist within your account, only a single blocklist can be applied to a SIM group concurrently.

Learn more in our Wireless Blocklist API documentation.