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Incorrect 'unlatching' code entered too many times

Level 1: Joiner
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My elderly parents have an old O2 Samsung J3 and when the 02 contract ended towards the end of last year, they got a Vodafone SIM not realising the phone was locked to 02!  When they put the SIM in and the phone asked for the unlatching/network unlock code, they kept inputting the screen lock PIN which has now hard-locked the phone by the looks of things.


I have an old Vodafone handset and the Vodafone SIM works OK in there so presume there's something I need to do on the O2 Samsung J3 to get it to unlock and 'read' the Vodafone SIM?


I did get a couple of Network PUK codes from O2 already but those codes don't seem to work on the screen where it says to enter them (i.e. as soon as I boot up the phone).


Any ideas anyone?  Saw a reference to @Martin-O2 in another thread who may be a good source of information for this sort of thing?


Thanks in advance

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Level 94: Supreme
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You need the MCK code which 


@LukasB or 

@TheresaV can help you with.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
Message 2 of 3

Former Staff
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Hey @AlanEBrown I will send you a private message as I need some information and then will request the MCK for you.

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