Check if a Device Works on CommsMobile (Compatibility & Blocked-Device Check)
Published:
Overview
Since Telstra's 3G network closed (28 October 2024), a phone needs 4G/5G and VoLTE to make calls and reach 000 on CommsMobile. This guide shows how to confirm a device is supported and what to do if it is blocked. To turn VoLTE or Wi-Fi Calling on, see Voice Calling Features: VoLTE & VoWiFi.
Steps to Check Device Compatibility
- Find the device IMEI — dial *#06# on the handset to display it.
- Open the Telstra Wholesale Device Capability Checker (3G Network Closure / Blocked Devices Checker).
- Enter the first 8 digits of the IMEI.
- The checker confirms whether the device is blocked or has limitations.
- If the device is blocked, replace it with a 4G/5G handset that supports the required bands — especially B28 (700 MHz).
If a Device Is Blocked or Limited
- Update the device software/firmware to the latest version.
- Confirm VoLTE and Wi-Fi Calling are switched on — see Voice Calling Features: VoLTE & VoWiFi for the steps.
- If calls still drop or the device stays blocked, upgrade to a fully compatible 4G/5G handset.
Key Notes
| Item | Details |
|---|---|
| Why it matters | An unsupported device can lose calls and 000 emergency access |
| Critical band | B28 (700 MHz) — missing it causes patchy indoor/regional coverage |
| IMEI | Dial *#06#; the checker uses the first 8 digits |
| Blocked device | Must be replaced with a supported 4G/5G handset |
| Turning on VoLTE | See the VoLTE & VoWiFi guide (Article 47) |
| Network details | See the network coverage, bands & speeds reference (Article 40) |
