The phone supports GPRS and UMTS Internet access methods. Its dimensions are 89 mm × 47 mm × 23 mm, and it weighs 109 grams. The supplied battery has a capacity of 950 mAh and can last up to 310 hours in standby mode, or 195 minutes if the phone is used for calls. Other notable features of the phone include Touch-sensitive navigation keys using FSR (Force-Sensing Resistor) Technology, MP3/AAC player, Bluetooth, a Java virtual machine, FM radio, 16M colors QVGA TFT LCD, and 3.2 megapixel camera with autofocus.
Another trait of the SL91 is its desktop stand. It serves as a charging station and handsfree speaker. When it is charging the battery or the phone is ringing, the stand lights up.