Telstra 3G mobile network exit

Telstra is upgrading the mobile network to deliver a better experience for all users. As part of these improvements, the current 3G network will be retired and all users will move to the more modern 4G and 5G network. This will impact Cmobile customers who have a C Blue – Telstra network plan.

The current Telstra 3G mobile network (850Mhz band) will be retired on 30 June 2024. There will be no interruption to 3G services or network coverage prior to this date. After 30 June 2024, the mobile network will only support 4G and 5G devices. Note, your 4G device will need to support Voice over LTE (VoLTE) to support voice calls. Most modern smartphones support VoLTE and WiFi calling which uses digital packet technology to route voice traffic and transmit data.

If you have a device that only supports 3G or it is a non-VoLTE capable 4G mobile device, it will cease to operate on the Telstra network after 30 June 2024. You will need to upgrade to a new device that supports 4G VoLTE and 5G networks to maintain your service.

If you are unsure if your device supports 4G or 5G, please contact us at or call us on 1300 545 000 and we will be happy to help you.

Frequently asked questions

I have been told my device will stop working, why?
Telstra is improving the mobile network to deliver a better experience and move to a more modern, faster and energy efficient network. To do that, the old 3G network will need to be retired to support modern 4G and 5G technology. Devices that are 3G-only or not compatible with 4G will stop working once the 3G network closes. To maintain your service, you will need to upgrade your device to a suitable 4G or 5G device.

What do I need to do?
You must upgrade to a 4G and/or 5G compatible device to stay connected to your service. When you upgrade, be sure to confirm the device is compatible with the Telstra 4G and 5G networks by checking the specifications on the manufacturers website. If you are not sure you can always contact us to confirm.

How can I tell if my device is affected?
The best way to find out is to search for the specifications of the device online, visit the manufacturer’s website or ask the retailer where you purchased the device. You can also contact us for help.

Do I need a new SIM card if I upgrade my device?
Our SIM cards already work on the 4G and 5G network. You will only need to replace your SIM if the size does not fit in your new device. If this is the case, please call us to arrange for a replacement SIM card.

My device is 4G, but I received a notification about the 3G exit. Am I impacted?
If you received a notification about the 3G exit from us, then you are most likely impacted by the 3G exit. It could be that your 4G device is not VoLTE (or 4G voice) capable. Your 4G device will need to support VoLTE to make and receive voice calls once the 3G exit occurs.

What is VoLTE?
VoLTE is the next step in voice calling technology for mobile phones, enabling users to make voice calls over the 4G network. This means clearer calls and faster connection times. Users who have compatible devices will already have access to VoLTE and WiFI calling. When the 3G network closes, VoLTE will be required to make and receive phone calls.