Mobile Spectrum in Telecommunications is like prime Real Estate in many respects.

Mobile Network providers buy Mobile Frequencies to allow them to build their infrastructure and Optus did just that in the early days of 3G with the acquisition of what they call their 2100Mhz and 900 Mhz spectrum.

Generally speaking the 2100MHz network provides 3G services to metro areas, and 900MHz provides 3G services to regional/rural areas as the 900 Mhz band has more power and reach

However, now that we have moved on to 4G and more recently, 5G technologies, the Networks need to re purpose ( known in the industry as re farming ) their spectrum to make it more efficient.

Again using the Real Estate example, it would be like a “knock down, rebuild”

Optus have decided that the existing 3G 2100 Mhz spectrum could be better utilised to support the newer technologies and as such, it will be shut down from May 2022.

Whilst it will impact a small number of you, it is still good to understand the impact ( if any ) to your Products and Services that rely on the Optus 3G network to function.

From May 2022, if your device relies on the 2100MHz 3G spectrum, you’ll be unable to make calls, send or receive texts, and browse the internet on the Optus Network.

Below is the communication from Optus regarding the Shutdown with a guide to the FAQ’s that may be of interest.

As always, Connect My Tech can help you to understand the changes and advise on how best you can upgrade your Products and Services to minimise any impacts


What’s changing?

Our 3G network runs on two spectrum bands called 2100MHz and 900MHz.

From May 2022 we’re repurposing the 2100MHz part of our 3G network to boost the capacity, speed and reliability of our 4G network and allow us to rollout 5G to even more Australians.

For those interested, this standard practice is called
re-farming when a specific mobile radio frequency band is repurposed from one technology to another.

Will I be affected?

From May 2022, if your device relies on the 2100MHz 3G spectrum, you’ll be unable to make calls, send or receive texts, and browse the internet on the Optus Network.

You can check if your device will be affected by contacting your device manufacturer, via their website or by calling them, to confirm if your device is reliant on the 3G 2100MHz spectrum.

We’ve also included a list of commonly used 3G devices that may be impacted by these changes.

Check if your device relies on 3G 

What to do before May 2022?

To enjoy all the great benefits of our 4G and 5G network, like improved voice and video calls, and faster internet speeds, you have a few options.

Upgrade device

If you’re a postpaid customer, you can upgrade your mobile, modem or tablet today. Not sure what to get? Our team is here to help.

Purchase outright

If you decide to buy a new phone or device outright, check the specifications to confirm it will work with our 4G network.

Ask family & friends

Many Australians upgrade their phone each year. That means someone you know may have a spare phone you can use. Just be sure to check it’s compatible with our network.


Frequently asked questions

Do I need to change my prepaid plan?
Does Optus Prepaid have 4G Volte?

Check if your device relies on 2100MHz band 3G

To see if your phone or tablet will be affected, check in with your device manufacturer. You can visit their website or give them a call. In technical terms, you’re looking to confirm if your device is on the 3G 2100MHz spectrum.

Common devices that may be affected:

iPhone 3GS A1303 Samsung Galaxy Ace
ZTE F286 Samsung Galaxy S2
iPhone 3G A1241 Nokia 6500s
Nokia C2-01 Samsung F480i
Huawei Eco Y3II Nokia N73
Samsung Galaxy Pocket Neo Nokia 6280
ZTE Telstra Tough 3 Nokia 6120 Classic
Samsung SGH-F480 Nokia 208
BlackBerry Bold Nokia N70
Nokia N95 Samsung Galaxy Trend Plus
Nokia Lumia 520 Samsung SGH-J750
Nokia 6233 Nokia 6500 Classic
Nokia 6110 Navigator


Patrick Larobina