Even with the preinstalled apps there were problems. In the first ipod touch and iphone there was a flag set to not be able to create events in the calendar ap

Even with the preinstalled apps there were problems. In the first ipod touch and iphone there was a flag set to not be able to create events in the calendar app! (Calendar was read-only). Later updates fixed it but if you had an ipod touch you needed to pay for the update (maybe 15$?).