Unlocked. Can be used with Centurylink and probably all other DSL providers. Most providers will try to convince you to rent their modem instead, which would be crazy stupid to be paying for every month). This modem is compatible with ALL the latest common DSL standards, including ADSL and ADSL2+.
Works.
Great specifiations:
4 ports for cabled InternetWifi speeds up to 300 Mbit/s2.4 GHz 802.11 b/g/nThe modem itself can download up to 20 Mbit/s when connected to a ADSL2+ network, as measured by Centurylink performance test.For more details, check with the manufacturer (ZyXel)
Important:It does not come with the wifi antenna. It is a standard BNC mount wifi antenna. It will still work but at shorter range.