Flashing custom rom to unlock Oppo F1F network lock ? - Oppo F1

Hi guys
i have an optus locked oppo f1f which im thinking of giving it to my parents to use.
if i root and flash a custom rom will that remove the network lock on the phone?
is there another way to unlock it without having to pay optus or someone else?

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[Q] Will ROM flashing unlock the phone?

Hi everyone!
I have a Huawei U8180 locked in Orange. Will ROM flashing unlock the phone? I mean after flashing would be possible to use any carrier around the world?
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P.S: Sorry for my English, it's not my first language.
Neither rooting nor flashing another ROM will remove the carrier lock on a phone normally. You'll probably have to look up specific instructions for your phone.
As far as I know, most carriers will give you the unlock code after the contract has been completed. You may have to try calling a few times to get someone who knows how to do this, though.
No, ROM flashing will NOT unlock your phone. You need a specific code to unlock it so that it will accept any carrier's SIM. This can be obtained from your current carrier.

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Hi guys, can you please guide me on what to do for my friend's locked phone, he is coming from Sweden so her phone is locked to use only certain simcards..do I have to root her phone? If I do root the phone how do I unlock the phone? Can I unlock with out rooting? I prefer not to mess around so much with her phone..
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