Hi Yvonne,
Apple's desire to protect their brand value makes it really hard to find wholesalers for Apple products such as iPhone. You need to fill-out an application on Apple's website should you want to source these items at a wholesale rate. Do note though that the annual minimum purchase for these items requires more than $100,000. You can read the full requirements here: Link hidden: Login to view
The same goes for Samsung. Check-out their distributor program here:
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You can purchase Apple and Samsung products at SaleHoo but mostly from Liquidators.
Here are a few suppliers you may want to check out:
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Hope this helps.