Other than placing a sim card, is there a way of telling an iPhone is unlocked?

i have iphone first generation in front of me, jailbroken , unlocked. jailbroken see cydia installed.
now, other placing tmobile sim card in , activating (no sim card available outside of at&t card installed), there way of spotting iphone being unlocked?

 

as apple never sold unlocked first generation iphones in us, check model number. if ends ll, locked at&t. because it's first generation iphone, easy unlock.

 

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