Prompted for SIM network PUK

[Dannyb0y7]

My Samsung S7 battery is failing to charge, so I have ordered a replacement smartphone on-line.

It is a reconditioned Samsung S8.

I inserted my O2 SIM and I get the message:

SIM network PIN blocked   Enter SIM network PUK

I spent nearly on hour on phone to O2 Customer Services, they gave me an 8 digit code which was unsuccessful, then another 8 digit code which was also unsuccessful, followed by two obvious 4 digit codes. Also, unsuccessful.

Any ideas, please?

[Enlli]

SIM Network PUK on a Samsung  indicates that the phone has been locked to a Network other than O2 

Two options, speak to the vendor and get them to unlock it, or get it unlocked yourself at a phone repair shop.

Nothing O2 can do

[MI5]

It will also now require a NUK as you've tried the wrong code too many times.