only the carrier that locked it can unlock it apple don't have the power
so if you mean factory locked then the carrier it was locked to
if you ment to write factory unlocked then you likely got chaeted by the person who claimed it was factory unlocked and you just bought a jailbroken simunlocked phone
Your iPhone seller is mis-informing you. Only the carrier to whom
the iPhone is locked can initiate the unlock, and not all carriers do
so. Contact the carrier to see if they offer unlock and what conditions
apply. Use of gevey sims is illegal in most - if not all - countries due
to how they work, and prevents any support from this forum. Contact
your seller and have him straighten out your iPhone if he can - you
might be the proud possessor of a brand new brick (no-functioning
iPhone that cannot be repaired or made to work).
Once you know the carrier, check their website for contact
information. If your iPhone seller cannot determine the
carrier your iPhone is locked to, try contacting AppleCare
and they may be able to determine which carrier the iPhone
was sold to. Contact information is in the lower left hand
corner of all pages in this forum - click on "Contact Us".
Thank you for the courtesy of marking my previous response as
a correct answer. If you need more help or have other questions,
please post again and someone will assist you.