Honestly guys, save your time & effort.
Most countries have blocks of numbers reserved for 'never to be used' reasons.
Here's Wiki's explanation rather than my muddled one:
"Ranges for fictitious telephone numbers are common in most telephone numbering plans.
One of the main reasons these ranges exist is to avoid accidentally using real phone numbers in movies and television programs because viewers frequently call the numbers used. An example of this situation is with the 2003 film Bruce Almighty. The makers of the movie opted not to use a fictitious exchange, and several people whose phone numbers matched one mentioned in the film were inundated with callers asking for "God", and the number was edited out for television airings of the movie and on most copies of the DVD"
...
United Kingdom
Ofcom has also reserved certain number ranges for use in television dramas and films, so as to avoid the risk of people having their telephone numbers displayed, and receiving unwanted calls. This is similar to the use of fictitious telephone numbers in the United States and Canada with the digits 555.
In most of the large cities with three-digit area codes a range of numbers is reserved, usually all the numbers starting with the digits 496. For fictitious numbers in other areas the area code 01632 is reserved; this code is not in use, although 0632 was used for Newcastle upon Tyne until the late 1980s (63 = NE). There are also reserved ranges for fictitious mobile, freephone, and premium rate numbers.
The only 'live' contacts were the email addresses for a short time after the series was first released.
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Also, please note that sentences can also end in full stops. The exclamation mark can be overused.
Sherlock Holmes 28 March 13:08
Mycroft’s popularity doesn’t surprise me at all. He is, after all, incredibly beautiful, clever and well-dressed. And beautiful. Did I mention that?
--Mark Gatiss
"I know that you believe you understand what you think I said, but I’m not sure you realize that what you heard is not what I meant."
Robert McCloskey