If you are an Internet user then you must have knowledge about using a modem. Problem is that not all modems work for access to the Internet services provided by all providers. It is different for different service provider. For instance; if you want to access the CenturyLink Internet services then you need to use a CenturyLink compatible modem. It is because unless the modem used by you is their brand product or one of the CenturyLink approved modems, you will not be able to use their Internet services.
Many Internet users prefer CenturyLink because it provides high speed Internet access with use of best technologies in the area. Over the years experts have tasted and found out the ones that are compatible with CenturyLink network. Their recommendation is use of high speed DSL technology based modem that is usually compatible with CenturyLink technologies. It has been established that a CenturyLink compatible modem uses DSL technology.
As the end user you may not have the technical expertise and knowledge to identify the third party provided modem that works with CenturyLink Internet services. In such case obtaining expert advice would be expedient. Best course of action for the buyer would be accessing an informative and educative website that lists out the CenturyLink approved modems providing all details for the end user.
Bottom line of all these is that to have seamless access to the CenturyLink Internet services you need to use a CenturyLink compatible modem or if it is third party product then one that is approved by them. Finding information becomes easier by accessing an informative site that provides all you need to know.