I have an old Telstra 4G USB+ wifi plus dongle which will no long work but it still has $140 credit on it: how can I transfer this credit balance to new 4G wifi plus unit I brought?
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You can't transfer the credit could transfer the SIM to new modem which would transfer the old modems number and account to the new modem.
Contact Telstra to request a SIM replacement for the old account.
It can also be done over the counter at a Telstra Shop.
You can go to a Telstra Store and ask them to transfer your number and account to a new SIM.