I use prepaid mobile broadband on my laptop via an optus modem but I cannot find a way to check my usage as I cannot open an account. Any suggestions would be appreciated.
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Some of those modems have an inbuilt sms feature built into the administration section. If you send an sms to 9999 with the word 'Balance" as the subject you should get that information sent back to you.
If I'm understanding your question correctly you'd need to ask the broadband provider you're using, Lisarpink?