What should I do after a Sergeant at my AIT Company took my phone and lost it?

Just to be clear you had your phone at AIT and you are allowed to access to the internet? Where was this?

Apologize to the NCO for making a nuisance of yourself and creating a distraction.Then assure him that it won’t happen again.Then ask if he will trust you with the phone now.

The fact that you had a phone in AIT blows my mind. I don't recall tradoc allowing phones during Basic and AIT but I went to ft knox where a phone was pay phone for 7 seconds for 17 weeks ... The good ole days

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Its obvious your phone got taken away because you where not suppose to have it but that is not the important part right now. If you actually are sure and have confirmed that your Phone is lost, you should report to a higher NCO.

The NCO who took your phone should’ve provided you with a DA 2062 Hand Receipt. If not, it might be difficult to prove he took it and lost it. Do everything you can think of to locate it. If no results, report through CoC at the lowest level and work up.

Ask him using military bearing, for an update or what’s his plan of action will be in the event they don’t find your phone. Always try to solve at the lowest level first (less paperwork, and BS on everyone). The NCO lost/misplaced the phones and it’s his job to find it. On another note during the duty day at AIT just leave that shit alone and secured in your room, I personally feel it’s a distraction to have it during the duty days, and believe me many more times in your military career you will most likely not be able to access your cell phone (IE, deployments, training exercises, etc). I’m not saying you shouldn’t keep asking about your phone, because he shouldn’t have lost it in the first place. I am saying take not having your phone as a learning experience for the future.

Did you receive a confiscation form or receipt. If not on paper it didn't happen.

This is sad on so many levels. What have we become?