Is a US number SMSable?

gistfile1.rb

class String

  # http://en.wikipedia.org/wiki/North_American_Numbering_Plan
  @@bad_phones = 0.upto(9).collect{|t| t.to_s*10} + ['231231234']
  def is_smsable?
    return false unless self.is_phone?
    return false if self.gsub(/[0123456789\-\.\+\(\) ]/,'').present? # non-phone number chars are present
    return false if self =~ /\A\s*\+\s*[^1\s]/ # International number
    us_ten = self.gsub(/\D/,'').gsub(/\A1/,'')
    return false if us_ten.size != 10
    return false unless us_ten =~ /\A[2-9][0-8]\d[2-9]\d{6}\z/ 
    return false if us_ten =~/\A\d(00|11|22|33|44|55|66|77|88|99|00)/ # "ERCs" easily recognizable codes
    return false if @@bad_phones.include?(us_ten)
    return false if us_ten =~ /55501\d{2}\z/ or us_ten =~ /5551212\z/ or us_ten =~/\A555/
    true
  end
end