Busy signal

src: mn2s.com A busy signal (or busy tone or engaged tone ) in telephony is an audible or visual signal to the calling party that indicate...

Computer-assisted telephone interviewing

src: www.surveysystem.com Computer-assisted telephone interviewing ( CATI ) is a telephone surveying technique in which the interviewer fol...

Boost Mobile

src: www.phonedog.com Boost Mobile is a wireless telecommunications brand used by two independent companies in Australia and the United Sta...

Security alarm

src: www.reviews.org A security alarm is a system designed to detect intrusion - unauthorized entry - into a building or other area. Securi...

Motorola StarTAC

src: upload.wikimedia.org The Motorola StarTAC is a clamshell mobile phone manufactured by Motorola. It was released on January 3, 1996, be...

Prepay mobile phone

src: banner2.kisspng.com A prepay mobile device (also commonly referred to as pay-as-you-go ( PAYG ), pay-as-you-talk , pay and go ,...