Yes mobile accessories stall is also a good option... you can start it with a small capital and later you can add a mobile repairing lab and mobile resale and sets...
don't ever get into competition with other shops... Just need to follow a simple business law... Less margin will get you the more customers...
More customers will make your business successful...
You need to figure out from where you can get the best quality in the lowest price... Try to buy the things from the Main wholesale dealers...
Find a good point where u can see a walk in customer are more... No need to go in the major markets you have to find a good point.