You can monitor all conversations around the phone, including the conversations of the person who is carrying it, without his knowledge. The spy phone can dial out and receive phone calls in Normal mode just like a regular cell phone.
 
We can modify NOKIA and SIEMENS mobile phone series. The telephone is programmed with a telephone number and when anyone calls the Spy phone, it rings and operates as a normal telephone but when the phone is called using the telephone with the number that was previously programmed into the phone, it automatically answers without any ringing or lights coming on and it turns on the built in microphone to listen to all the surrounding noises or conversations. There is no other Spy Phone like it anywhere.

Use it as an Infinity Microphone from anywhere in the world. It also works with any SIMS card. 
 
 
Nokia 3310 
Nokia 8210
Nokia 8850