I'm waiting for a new bankcard, and so cant buy data online for now.
#1.Can I use cash, (buy an Optus voucher) ?
and #2.how to loadup my Optus ZTE modem then?
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You should be able to organise a top up at any Optus store. They'll ensure the modem SIM gets the credit. Alternatively give a mate or family friend the cash and ask them to do the online top up for you.
Your modem should have a "phone number' assigned. You can just top up using a voucher as usual for any prepaid.
Another option for right now is setup a paypal account linked to your bank account. You can pay Optus via PayPal.
"Your modem should have a "phone number' assigned. You can just top up using a voucher as usual for any prepaid."
Thanks a lot Peter, The modem does have 'phone number' but how do I connect the voucher code to it?.. via one of the recharge options on my account site?.. or does it involve a physical action on the modem?