Unlocking an iPhone without the original SIM card in?

So I sold my old iPhone online, my friend checked it first and assured me it was unlocked but the buyer has just gifted it to her son for Christmas and it's not unlocked. It's a complete nightmare! The original sim is now in my new phone and the old iPhone is with this woman so I can't put the original sim in the old phone, it's from Vodafone and they require account holder info and an IMEI number found by calling a number. I d be calling that number from my new phone with my old sim so IIm not sure how this would unlock the old phone? I'm in desperate need of help!

You are going to have to contact Vodafone and have them help. You may need to get the old phone back in order to properly unlock it.

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