The best way to keep away from them is by getting scammed once and learn your lesson, just kidding that's stupid, well that' s my case. You need to look out people sell stuff not to much under priced but pretty cheap, so you think your getting a good deal cause its not an iPhone that cost $500 and your paying $100 rather your paying $400, and if you look close it says everything that comes in the box, and at the end it says "please note you are only getting information on how to get it for that price, and you will not be getting the Phone and box" and yes i lost about $500 from that ugly scam.