The most common signs that a phone line is being tapped are strange beeps and clicks on the line during a normal telephone conversation. Additional signs include phones that light up when not in use and unusually warm batteries in phones that are not being charged or used in any way.
According to an investigation by WTHR news in Indiana, spyware sales are at an all-time high, making it easy for criminals to tap into cellular phone lines and land lines. Spyware programs can be purchased online and utilized to record telephone conversations, as well as record conversations that occur anywhere a cell phone is located. This is due to the fact that certain spyware programs enable the user to activate the speaker features on both cell phones and land line phones.
The only way to determine 100 percent if a land line or cell phone is being tapped is by contacting the police or a security expert, as they have the tools and experience necessary to determine if phone lines are corrupted. Security experts also recommend for cell phone users to remove phone batteries when phones are not in use, as well as use pre-paid cell phones for highly sensitive communications.