Yes, you can get Internet Service without a landline. Your local Cable Provider will offer Internet Service. But, as of 2023, you can use your mobile phone as a hotspot for WIFI and increasingly, get wireless internet service through mobile phone carriers.
Dial-up Internet access, which requires a telephone landline, has been replaced by broadband Internet access, which does not. Depending on where you live, it is likely that you do not need a landline to access the Internet. Broadband is a faster Internet service that is always on and it won't tie up your landline, if you have one. Several different broadband transmission technologies are available.
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Digital Subscriber Line
More commonly referred to as DSL, digital subscriber lines transmit data over traditional copper telephone lines that are already wired to homes and businesses. Although it uses telephone lines, it does not require users to keep a landline phone in their homes.
Cable modems allow Internet providers to transmit data to homes through the same coaxial cables that deliver cable TV to homes. A cable modem is plugged into a cable wall outlet to retrieve data, and into a port on your computer to allow access to data.
Fiber optics converts electric data into light and transmits it across cables made of glass fibers. Internet access via fiber optics is drastically faster than cable and DSL Internet access. Fiber optic Internet access is not as widely available.
Satellite Internet service is slower than other types of broadband Internet access, but is available in many rural areas where the other options are not. Satellite Internet access works in the same way that satellite TV and phones work.