This GSM Wireless Desktop Telephone supports 2 SIM cards (SIM cards not included) and operates on the GSM900/1800MHz frequency. Experience superior service quality with its strong battery. The phone book has a high capacity, and the phone also features SMS functionality, a call history, caller ID, loud speaker, redial and handsfree function, and different ring tones and alarm ringers. It has a backlight LCD display with date, time, signal strength, and battery volume status icons. It's easy and simple to use and can be placed on a desk or mounted on a wall. This versatile phone is perfect for any home, office, hotel, or telephone shop and has dual sim card slots.