Here in Switzerland the major telco (Swisscom) has an option to let you see your last 20 answered and missed calls on your account webpage.
Not wanting to log in every time I want to check if I missed a call, I wrote some scripts and that fetches the content of my account web page and display them on an iOS app.
An added feature is to receive a notification via Prowl when a call is missed.
Or perhaps all this was an excuse to write some code during the holidays. Who knows.
The code is available on my Github page.