It depends on your local phone company, and in some cases on your location.
Dial "O" for Operator
Dial *1#
Usually, the term "dial-up number" refers to the phone number you dial with your modem for dial-up Internet.
Dial 411. That is information.
It is the number you dial to ring their phone.
First Pick Up The Phone Then Dial *67 And Then Dial The Number
011354<phone number>
I will call that number againand again untill he or she answers.
depending on the phone you have to dial Star (*) 69 or star (*) 67
You dial +34, then the Tenerife phone number.
To dial an Italian phone number, first dial the international dialing code for Italy, which is 39. Then, dial the Italian area code (usually starting with 0) followed by the local phone number. Make sure to include the full number, including any additional digits or extensions.
For outgoing Comcast phone calls. Dial *82 before you dial your intended number to unblock your phone number for one phone call.