Considering what is known about memory, most telephone numbers are seven digits long because:

Most telephone numbers are seven digits long because this is the maximum amount of items which can be held in short term memory in a specific moment of time. If digits were more than seven it would have been difficult to memorize them and remember as short term memory refers to a very limited period of time.

i heard they are taking it off i hope this isn't true but otherwise if it doesn't get taken off it will probably be in early december or early january of 2018-2019