The Siemens AF51 mobile phone is a Tri-band GSM clamshell from Siemens weighing about 80 grams and measures approximately 79 x 41 x 19.55 mm. The phone comes with a 65k color CSTN display with a resolution of 130 x 130 pixels. The external screen of the clamshell is also of the same specifications but with a resolution of 96 x 64 as it is much smaller. Keeping in touch with family and friends is simple using this pocket-sized phone with integrated antenna.

The external (96 x 64 pixels) display boasts a classy mirror effect, while the durable internal display (130x130 pixels) is protected by scratch-resistant glass. Moreover, both displays are in full color (65,536 colors), another first in this segment. An Incite Service Light Indication LED informs the user about missed calls or incoming text messages in even the gloomiest light conditions. This ultra-compact phone with distinct clamshell shape comes in a high-quality finish with satin metallic colors of Panther Black and Dolphin Grey that meld subdued elegance with overtones of glamour.

The battery of the Siemens AF51 mobile phone lasts for a good 6 hours talktime, but with a relatively low standby duration of 220 hours. The Siemens AF51 mobile phone does not come with a camera or even a memory card slot. The only data network supported by the phone is GPRS, which you can use with the WAP 1.2.1 browser. Again there is no xHTML browser so you are pretty much limited to low browsing capabilities.

 The other features of the phone are built-in handsfree, Java MIDP 2.0, a T9 dictionary and easily usable organizer. The Siemens AF51 mobile phone comes in grey and black colors.