Unlocking a iPhone 5 what is on EE?

I've bought a a new iPhone 5 (apple replacement) which is locked to EE. I've been quoted £139.99 to get it unlocked! I know EE will unlock it for £20 odd if you are a customer for at least 6 months. Well my sister is a EE customer and also happens to have a iPhone 5. Can I use her details then give them the IEMI number of my phone?

Your wee wee is on ee

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