Nokia 6120 Classic breaks many stereotypes. While, its light weight makes it different from other bulky 3G phones, the stylish silver and white casing of the phone, makes it look stylish and elite. The phone measures 15mm and weighs about 89 grams to comfortably fit into the hands or pockets. Even in terms of usability, the handset is quite satisfactory. The screen is large enough to view text messages properly and the keypad is well laid out, so you don't need to use your fingernails to text. Another noteworthy design is the placement of loudspeaker. It's on the side of the phone, instead of the back. Which means during a call, you can simply place the Nokia 6120 Classic on a table facing up and have a clear conversation without any disturbance to the sound.

In terms of feature the Nokia 6120 Classic is endowed with every quality of a 3G handset. The device offers a secondary VGA camera for video calling, and browsing the Web is quite speedy over an HSPDA connection. Since the handset is empowered with Symbian platform, it comes at par with a smartphone. Thus, the users have the advantage of Quick office, Adobe PDF reader, and the option to install third-party apps, such as maps and dictionaries. The Nokia 6120 Classic's music player supports MP3, M4A, eAAC+ and WMA files, while the 2 MP camera makes clicking a pleasure. Performance wise, the Nokia 6120 Classic offers good sound quality, with no major muffling and distortion of voice. The loudspeaker offers clarity and good voice, and its placements makes the performance better. The camera is quite decent, but again not outstanding. Nonetheless, the camera performs good for MMS messages. The HSDPA connectivity works fine, reaching speeds of up to 1.8Mbps. So, downloading stuff from the net is at lightening speed.