Why is Find my iPhone saying i have no devices?

My phone got stolen 2 hours ago at a park it was on a plan but it was att i had no sim card i went home to try and locate it on my moms phone but it said no devices i literally screamed why is it saying this luckily i have a passcode on it

Because it doesn't have a sim card

If you never registered your iPhone to an iCloud/Find my iPhone account, it won't be there.
Also, if your iPhone didn't have cellular data enabled, there's no way it can be connected to the account.

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