Absent features

iPhone lacks a number of other handheld features that have not already been mentioned and are common in competing devices, including 3G support, voice dialing, voice recording, instant messaging, a memory card slot, MMS, tethering, A2DP, common Bluetooth file transfer (OBEX), GPS capability, copy and paste, native games, and support for MP3 files as ringtones. However, some of these features can be utilized by un-official means.