If you are looking for a reputable mobile phone supplier, then I don't think you can do better than the company that I recently bought a Nokia 808 pureview from. Their prices are very competitive and their sales support is the best I have experienced. What I liked most, though, was their remarkably quick response to my questions, both before and after the sale.
I ordered the phone on Thursday 30 August 2012 and it arrived at my door on Friday 31st - amazing since they are in Singapore and I am in Sydney, Australia.
Unfortunately the phone died after a couple of days. This was no problem for them - they provide 12 months warranty. I sent the phone back and they immediately sent me a replacement the same day they received it. No delays or questions.
They have always replied to my questions within a few hours and have been very courteous.
I would most certainly buy from them again.
The company is "Tropical Computer Systems" and they trade on eBay as rose528400. I have included a link to their eBay site. http://myworld.ebay.com.au/rose528400/?_trksid=p4340.l2559