Yes RJ12 connectors are used to connect wire to dial up modem
The G3 and G4 iBooks had a built in modem which can connect to a dial-up service.
No. A modem is used for dial up.
Modem is a what not a who. A computer modem is a device that uses an analog carrier signal to encode digital information. The modem is how you connect to dial up Internet.
Depending on how old the modem is, it may connect to the serial port, the USB port, or an internal connector.
You need a modem and a phone line. connect phonel line to modem. you'll also need a subscription to dial up internet service provider to connect to the internet.
A modem
Connect your cellphone to the computer and make a dial-up connection to the Internet.
A dial-up modem may be a plug-in card inside the computer, or it may connect to a serial or USB port.
If you use a USB dial up modem then yes you can. But of course you will have to have the modem manufacturers software to use it, and it has to support 10.7. I don't believe the later Mac's have any scripts for modems as Apple has dropped support for them completely.
You cannot connect an RJ11 cable to a RJ45 port. You can buy an external dial-up modem, though, that connects to a USB port. A link to where you can buy an external USB dial-up modem is below. http://www.amazon.com/Small-Compact-Lightweight-Modem-Connect/dp/B001C4EUFE
1. Dial-up - You use a dial-up modem in your computer to connect to the internet over a phone line. 2. Ethernet - You connect to a cable / DSL modem with an Ethernet cable, either directly to the modem or through a router. 3. Wi-fi - You connect to a cable / DSL modem with a wireless card to a router, which is connected to the modem. 4. USB - you connect to a cable / DSL modem directly with a USB cable. 5. 3G - A form of wireless internet that communicates using cellphone towers.