It is illegal to use an automated system to place commercial calls to, from, or within the United States, with certain narrow exceptions. Non-commercial calls, including political and charitable entities, are exempt, and a business is allowed to robocall you if you have an established business relationship, or if you have given your explicit permission. Note that this prohibition applies even if your number is not on the national "do not call" list. Unfortunately, enforcement of this law (Title 47, United States Code, Section 227, paragraph b.1.B.) is not very effective.
For dialing a telephone number outside your local area.
Dialing 97 and then a telephone number will reach a wrong number.
+ 44.
The Telephone related acronym DDD stands for Direct Distance Dialing
PBX is a Private Branch Exchange. It is a separate telephone exchange, to serve a large building or office. PABX is a private automatic branch exchange. Where you can contact individuals automatically within a building by direct dialing.
Centrex features allowed direct inward dialing (DID) to a telephone number and direct outward dialing (DOD) from a number without operator intervention
UK telephone area codes were first assigned in 1958.
Speed dialing is a system that allows you to dial an abbreviated code (usually one or two digits) instead of dialing the entire telephone number. You must program your speed dial numbers before using them.
That depends on where you're dialing from. In North America (USA, Canada, etc.), dialing 100 will get you an error recording telling you that you have dialed an invalid number. In some countries, dialing 100 will get you the local telephone operator. In other countries, it may get you some other service.
By picking up the telephone and dialing his phone number.
Dialing for Dollars was a franchized local TV game show in the 1950's to 1970's. The host would select a telephone number and call it; if the person answering the telephone could give the correct password, he or she won a cash prize.
a modem that has extra functions such as automatic answering and dialing is called intelligent modem