By calling a ,special access number, you can activate the cellular spy phone and turn it into a high‑tech bugging device that will let you hear 

1. Any sound in the vicinity of the phone and ("Listening Mode").
2. Phone conversations made or received by Spy Phone ("Interception Mode").
 
The phone operates as a normal mobile phone and you can make and receive calls as usual. However when you call the phone using the special access number, it automatically answers without any ringing or the owner being aware that you are connected to their phone ("Listening Mode"). It allows you listening discreetly to what is going on up to 5 meters away from the phone. There will be no record of call received from the special access number in the phone's list of received calls. 

The "Listening Mode" will be immediately interrupted if:

1. Spy Phone receives a call or
2. If any key of the Spy Phone is pressed.

Therefore, the interruption of the "Listening Mode" often means that there is an incoming or outgoing call of Spy Phone. Just call Spy Phone from special access number again and listen to conversation. In addition, Spy Phone sends SMS to the special access number every time it makes or receives a call (SMS Notification Mode). The SMS messages come in the following format: From: 0546774664 10/01/2005 12:25 ID: SpyPhone1001 Incoming:03764687

The function of SMS notification can be activated or deactivated remotely by sending SMS message in particular format from special access number.