This is a challenge cache. The cache itself IS at the posted coordinates.
These days, with almost everyone carrying a smartphone, and with many using an app on it to find geocaches, this attribute has really become obsolete!
This is a pretty simple challenge. To qualify, you must have found 200 or more caches with the "Telephone nearby" attribute. Use this challenge checker to see if you qualify:
Feel free to find the cache and sign the logsheet if you are in the area. Be sure to post a note on the cache page. But do NOT log it as Found unless you qualify. Found It logs that do not qualify will be deleted!
Have fun and don't forget to call your mother!