So we got the new shiny iOS 4 with the new not-so-shiny SDK 4. Most desirable aspect of using SDK 4 and iOS 4 functions is to be backward compatible with iPhone OS 3.x. This is where you should set your iPhone OS Deployment Target to iPhone OS 3.0 or anything else you want to be compatible with.

This is the official method, and since SDK 4 does NOT come with 3.x headers, the only method to make your app run on 3.x. But it is not so simple, because now in your Xcode you are using iOS 4 API. So how do you know you are not using classes or methods that do not exist in 3.x and putting them into your code will crash your app on 3.x device? You don’t!

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Recently released Wezwij Taxi is surprisingly no.1 free application in Polish AppStore since few days, and became no.1 one day after release.

I have just learned that AppStore is amazing phenomenon. It is quite impossible to predict impact of an application before it gets released. Some “silly” apps stay on top for weeks, while some real gems are quickly forgotten. So it is worth to test even most crazy wicked ideas against iPhone users putting them into life as AppStore app.

It is high time to release own application iPhone after spending a while doing apps for companies. So I decided to make something useful for myself what others can appreciate too.

Here are my very own apps:

• Strefa a Wirtualna Polska Strefa MP3 streaming audio client. Strefa MP3 is a portal containing over 100’000 songs of amateur and professional polish artists, every day brings tens of new songs. IMHO that is much better than commercial radio stations serving all those boring pieces we already heard before thousand times.
• Wezwij Taxi a polish taxi catalog and taximeter in one app. Now this program has one purpose: keep updated database of taxis for major cities of Poland. But in the future, I think this app can turn into some kind of one button taxi call, using your GPS position without a need to call or name your position to the operator. Useful for those traveling to unfamiliar cities.

Update: Strefa is already available at AppStore, Wezwij Taxi waits for fixes and resubmit.