I have a Iphone and have been loading Ham applications onto it… Below is a list of some of them.

• Amateur Radio Exam Prep for iPhone – Amateur Radio License exams are composed of questions from a pool. Use this application to practice all possible questions prior to taking your exam
• CallBook for iPhone– CallBook is an Amateur Radio application that allows you to look up call signs via the free WM7D server, the QRZ Online subscription service or the HamCall subscription server and track active APRS stations on www.aprs.fi. Lookup results can be emailed and the QTH can be instantly viewed in the Maps application
• Elmer for iPhone – iPhone Software to practice taking your Ham Radio Exam
• Freq Finder: iPhone Repeater Directory – Freq Finder is an iPhone based Ham Radio Repeater Directory that locates repeaters based on the user location.
• FreqLoader: iPhone companion for the mobile ham– FreqLoader is the perfect iPhone/iPod Touch companion for amateur radio operators, monitoring enthusiasts, shortwave listeners and anyone with an interest in the air waves. Whether you’re an active licensed ham or an avid scanner listener, FreqLoader will allow you to find what you’re looking for, keep track of your stations, maintain complete logs and share your finds with friends, groups and the world.
• hamDXcluster for iPhone – DX Cluster for iPhone application
• iLocator for iPhone – A small application for Apple iPhone that calculate grid locator from gps, wifi or gsm cells by IW2BSQ
• iPhone Ham Radio Callsign Lookup– This webapp provides an iPhone-compatible lookup of Amateur Radio Callsigns. It provides the name, address, and license class (from the FCC’s public records) of any US-Licensed Amateur Radio Operator.
• Morse Key for iPhone – A free simple touchscreen-based CW Morse Code straight key. Practice sending Morse Code on your iPhone.
• IBCNU APRS on the Iphone - The Live IBCNU feed can be found here.
• APRS – how to configure the application can be found at http://www.aprs-is.net/Connecting.aspx. Find Maps  at http://www.openaprs.net/iphone/

UPDATE

EchoLink is finally available for the iPhone and iPod touch. It even allows me to use my Bluetooth car kit to have a QSO.

HAM’s who use EchoLink on the PC and Mac will appreciate the value of this on the iPhone.