I've been thinking about purchasing a used Lumia 920 on Amazon and I was wondering if it would be safe to buy, because I've witnessed people buying imei blocked devices on eBay and thought the case could be the same for me.
I've bought phones off eBay ... - email w seller, ask about blacklist (email is tangible evidence)
- check feedback of seller (as seller, not buyer)
- use PayPal, gives you some time to grieve a bad transaction (don't know if Amazon takes PayPal ?)
Bottom line, do your due diligence ... (I've ONLY bought NEW phones off Amazon).