You're zero chance of getting genuine branded from China, that's the very first thing to bare in mind. There are of course genuine suppliers outside of China, but the best prices are really only wholesale prices, so you have to buy in volume. Even then, the margin on mobile phones isn't a lot. So you tend to need to outlay cash to make a small margin on products like cell phones.
Of course if you have the available cash to outlay, then you can make cash in that space. If you don't have the cash to outlay, my personal opinion is that you may well struggle to find a market if you are dropshipping.
Just my opinion of course :)
You can check through the directory for suppliers, anyone we have listed will be fully verified, so no issues in dealing with them.