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The lookout service is a paid app and feature however it was introductory for free during a trial periodpWhen you first got the phone most likely. If You Don't See the charge on your billing statement from T-Mobile and you do not see it as a subscription in the Google Play store then you are not subscribed.
if you have any doubt contact T-Mobile and let them know that you do or do not want the feature. Keep in mind though if there is some sort of subscription to the service uninstalling the app or disabling it will not cancel a subscription.
snn555 has some really helpful info above. Did you have more questions about Lookout?