Sim not supported but phone unlocked...

Hi!, got my confirmation email for the transfer of my number. Got the text message from my previous carrier. So i should be good to go, but the sim dosent want to activate...
Updates and network settings. I also did the network re-setting. Message i get is sim not supported, which should point to a locked phone but I had this phone with many different carriers..
Any idea what blocking the sim?


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