The bontel t1000 gsm fixed wireless landline desktop phone with dual sim card slottelephone support 2 sim cards (not included in the package) with a working frequency gsm 900/1800 mhz. easy to setup with no ground wire needed. phone has a superior service quality with a strong easy simple to use: can be put on desk or wall mounted. widely used in family house, office, hotel or telephone shops etc.features include:ideal for homes offices,universal ie supports all networks,dual sim,lcd display with green backlight,handsfree and speaker phone,caller id,sms functions,fm,clock display and alarm function,mute function,tnc antenna,gsm 900/1800 mhz,strong quality rechargeable battery 2000mah,high capacity phone book,micro sd slot sound recording