Depends. If it is PAYG and has just lapsed you might if it's been a while then no.
You would need to contact O2
Going by you username I assume you may be in Australia. Just to warn you that since the closure of 3G by the networks O2 PAYG no longer will work there
Guide: How to find help & contact O2
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
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