Is Iphone 4 8gig MD125LL unlocked?

i bought iphone 4 8gig @ craigslist, , model number md126ll , seller told me it's att iphone(theres att sim in phone). when turn on , put tmobile sim card in , works, meaning iphone 4 factory unlocked?

 

pker886 said: ↑

i bought iphone 4 8gig @ craigslist, , model number md126ll , seller told me it's att iphone(theres att sim in phone). when turn on , put tmobile sim card in , works, meaning iphone 4 factory unlocked?

click expand...

it's not jailbroken right?

 

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