If you are concerned that you will get addidcted, you have a very valid concern.
I never owned an iPhone, however I had a BB and Android.
The BB was a great business tool (which is really what i needed in addition to the calling capabilities).
After reading some ‘great’ reviews on the Android, I purchased one.
I hated it, as it is a great toy, with a browser on the go. however it really lacked a robust email structure, like BB has.
Currently, to avoid I have an Ipad, with a regular phone. like this, I avoid the addiction, as I dont carry the iPad on my belt.
however I have instant access to a browser and my emails (there is almost no start up time on the iPad).