Apart from the answers that give you the option of defining the function as self., you have another option of including the module and calling it without the module reference like this:
module Prober
def probe_invoke(type, data = {})
p = Probe.new({:probe_type => type.to_s,
:data => data.to_json, :probe_status => 0, :retries => 0})
p.save
end
end
and you can call it like this:
require 'prober'
include Prober
probe_invoke("send_sms", sms_text)