Hi there, @adcockf
Thanks for reaching out about your mobile troubles.
This can be that the SIM is no longer active on the network due to a deactivation or suspension etc.
In this case, 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.
Did we answer your question? Please mark it as a Accepted Solution and if you see something that was helpful to you or the rest of the community, giving a Kudos is only a click away.