Phone calls allow voice communication between two or more people without the people involved being near each-other via the telephone cable network. A telephone is needed to convert the sound to electrical signals and vice versa.
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Yes - calls to Virgin Media's 150 number are free from a virgin phone-line. Calls from networks other than Virgin will be charged.
manager is in the meeting how secretary answer the phone
Yes, some phone providers are permitting collect calling to their subscribers. Currently these services are allowing collect calls to be billed on their home phone bills.
The purpose of the BT answer phone service is to answer a phone automatically. One can find this information online in online resources about the BT phone.
I estimate about 2 billion calls are made in a day.