If I were to buy a phone that's with Optus off somewhere say Gumtree and the IMEI got blocked after I purchased the phone, would I be able to unblock it with a proof of purchase given that it is the correct receipt of the phone?
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Nope, it can be only released from the original owner..
The original purchaser / account holder of the blocked phone will need to contact Optus to request for it to be unblocked.