I have swapped out a telstra sim card from an inherited GSM iSocket (3G) and installed an unlocked Optus pre-paid Sim card. the telstra sim was working (network light flashing) but the optus card does not seem to be scanning the network 3G. I have put the optus sim in an iphone and it received sms messages and phone calls - so we know it is working at least on the 4G network. can anyone advise why it isnt working on the 3G network and yet the telstra sim does?
Generally speaking if the SIM card is getting 4G network on the iPhone, it's also able to receive 3G network signals.
We'd recommend checking if the other device is network locked or if it compatible with a Optus Sim card.
We would have to look up your full address @angelao68 in order to see if a certain frequency covers you.
It most likely is that your device is not supported on the Optus Network.
Please note that we’re unable to look into account details on Yes Crowd.
We recommend messaging us via the My Optus App. The team is available 24/7 and are ready to assist customers as quickly as possible.