Two things it can be blacklisted by network and then also Apple ID locked , network unbarring on Voda no backdoor route at present other networks yes
Apple ID removing yes but even then just a Apple camera and WiFi device due to network bar, handset can be unlocked to use abroad but again that’s only if no Apple ID on it
Vodafone may well remove bar if they have reasonable proof to do so
If was sold to you can then barred due to insurance and you can prove reasonable steps taken networks will often unbar
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