Although I haven't purchased from Link hidden: Login to view yet, they seem safe to deal with. I also did not encounter any negative reviews online, and have read some positive feedback here Link hidden: Login to view They accept safe payment methods, are based in Denver Colorado and have been conducting business since 2006.
Please note however that SaleHoo does not guarantee the reliability/safety of any supplier outside its directory.
Here's one SaleHoo listed supplier with refurbished cellphones - Link hidden: Login to view
Let us know if you need more help. :)