Hi, i am going over seas and rather than pay for roaming i like to use a local sim with a prepaid plan, how can i tell if my phone is unlocked? Its a S9+ on a optus postplan
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Generally postpaid phones are not network locked mind if you have doubts one could always ask a friend on a different network and pop there sim in and see if there’s access.
"private/personal" ie, don't put your account details, contact number, bank details etc..