The user can always be aware as to who is carrying the spy phone at any time. Besides dialling out and receiving phone calls like a normal cell phone, the phone answers discreetly when it receives a call from a previously programmed spy phone number. For instance, the call is answered without any ringing. No lights come on and the display screen appears motionless as if on ordinary standby. Endoacustica can also modify NOKIA, SIEMENS and PANASONIC mobile phone series. No other type of spy telephone can do all this. Furthermore, this phone can be used with any SIM card in any country. It can be used as an INFINITY TRANSMITTER. This means that the user can room conversations even from a distance or remotely.