Despite its small and sleek size in a classic candybar form, it still retained standard S60 features and also has HSDPA (3.5G), the fourth from Nokia to do so after the N95, E90 and 6110 Navigator.

All models feature a secondary front mounted camera for video phone calls.

The phone features a standard Mini USB connector which does not charge the battery.

The base of the phone also features a 4-part 2.5 mm socket for the supplied headset.

The 6120 classic user interface lacks the typical 3D animated menu items as well as some built-in software, such as the Stopwatch; third party programs can be installed to regain similar functionality.

Shape design is even rounder than 6120, and different function key arrangement.

The FOMA NM705i is the NTT DoCoMo version of the 6120 classic released March 2008.

Later, August of same year, introduced FOMA NM706i carries a same exterior design as the 6124 classic and NM705i specifications.