It might be quite difficult for you to earn an acceptable level of profit if you have little connections and expertise in this area.
This is a very saturated industry with smartphone vendors on every street corner.
Imagine that I am a customer who is looking to purchase a smart phone. My options would typically include:
-carriers such as T-Mobile and AT&T
-brick and mortar retailers such as Wal-Mart
-online retailers such as Amazon and Expansys
-specialized boutique stores that offer a multitude of international smartphones
Now consider the difficulty that you will face trying to compete with the organizations I mentioned above. Why would I choose to purchase a phone from you when I can buy from the bigger, more trustworthy and credible companies?
Of course, you could make a few dollars here and there, but the profit you make will not be worth your time and effort. You can probably earn more handling the cash register at Burger King.