This is the list 3 from the Big list of 50 Essential iPhone Apps 2012 which includes the apps from number 21-30.
Do not forget to visit the previous lists-
50 Essential iPhone Apps 2012 (21-30)
EBay mobile: This application provides facility for online shopping on eBay on your mobile.
Tube map: This application will lend you a hand in planning your journey. You can easily verify your Oyster balance, check departure times or even find stations.
Google earth: You can view entire earth from helicopter view using Google earth app on your phone.
XE currency: You can convert every currency using this application. It also features live currency charts and rates. Leading media companies feature this amazing application.
Bump: It is one of the best applications for the iPhones to exchange the contacts. The users can exchange the contacts by bumping with other devices.
Yell.com: Yell is one of the most needed apps ever if a local search is needed, it is powered by Yellow Pages which has been serving as local business finder for years.
BBC news: You can be in link with BBC news channel using this application. You will get all the news streaming from BBC.
Find my iphone: This is an amazing application as you can locate your lost phone using it. This application can locate your mobile phone in any area.
Dragon dictation: Dragon Dictation is a user-friendly voice recognition application that allows you to speak easily and you can see your text and email messages instantly. This application is powered by Dragon® NaturallySpeaking®.
iHandy torch free: This application provides a bright light on screen, to be used in dark. It works quite well as a torch.