Netherlands:
Country Code: +31
All mobile phone numbers start with: (0)6
After that there are 8 digits for the number.
Operators own ranges within those 8 digits, but I don't know if there is a full list of them, they probably change all the time too. What if a new phone providers comes along or anything else changes, besides the fact it's almost impossible to keep up to date about these changes worldwide, you don't really want to be updating your app every time.
I'd stick just with a dropdown for couties (
http://en.wikipedia.org/wiki/List_of_country_calling_codes) and let the user type the rest.
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