1st idea : Phone on the top of the fork
Advantages : Convenient and you won't need to take your phone from another location
Limitations : Expensive to mass produce
Overcome : Market it so that the cost will be brought down
Unique features : Talking phone so that you won't have to look at the screen to know who is calling
2nd idea : App telling cleanliness of the stall
Advantages : Avoid stalls that have a bad record of cleanliness
Limitations : Some stalls data could not be retrieved
Overcome : Gathering information by people who live near the stalls
Unique features : Convenient and works on andriod and OS X
3rd idea : App finding famous stalls
Advantages : Avoid eating stalls with not-so-tasty food
Limitations : Some stalls quality could dropped overnight due to change of staffs.
Overcome : Updating it on a weekly-basis
Unique features : Works as long as your phone OS supports it
4th idea : Spoon-like phone
Advantages : Attracts attention from passer-bys when using it and it's light.
Limitations : Functions are limited
Overcome : Adding a touch screen to it
Unique features : Able to eat with it too
5th idea : Forks and spoons phone
Advantages : Able to speak and eat at the same time
Limitations : You can only call and not play games
Overcome : Voice-command control (But it ruins the whole purpose)
Unique features : Eat and talk with it
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