From 28 October 2024, new regulations required mobile networks to block devices that cannot make emergency calls over 4G VoLTE. Here's what you need to know about how this works.

Understanding device identification
Every mobile device has a unique IMEI (International Mobile Equipment Identity) number. The first 8 digits of this number form the TAC (Type Allocation Code), which identifies not just the make and model, but the specific variant of your device.

Why variants matter
The same phone model might have different versions for different markets. For example:

• An Australian iPhone variant may support local 4G emergency calling
• The same model from another market might not
• Each variant has its own unique TAC
• Network compatibility varies between variants

The blocking process
When your device tries to connect to the network, it sends its IMEI. Network providers (in ALDImobile's case this is the Telstra Wholesale network) maintain a list of TACs that identifies devices unable to make emergency calls over 4G. If your device's TAC is on this list, it will be blocked immediately. ALDImobile do not control this list and are not able to add or remove TACs from it.

What happens when blocked

• Your device will display "no service"
• No calls, texts, or data will work
• The device cannot be unblocked
• Moving your SIM to a compatible device is the only solution

Restoring service
To regain network access:

1. Get a device with a compatible TAC
2. Move your SIM to the new device
3. Service will restore automatically

Checking your device
Text '3G' to 3498 to check if your device will be blocked. This check uses your device's TAC to confirm compatibility with Australian networks and emergency calling requirements.

Important: Once blocking begins, you won't receive notifications on a blocked device. Check compatibility and upgrade before the shutdown date.

After blocking begins, if a device doesn't connect that previously did, it is likely incompatible and the SIM should be moved to a compatible device to connect. It's important to note that you service remains active and won't be impacted by your device status.