Can i activate an iPhone 6 with someone else's SIM card?

I just received my brand new iphone 6 in the post, but i can't use my sim for another week. I was wondering if i could activate the phone so i can use it for music and Wi-Fi etc. But using someone else's sim? My boyfriend is on a different service provider but could i activate it with his sim then put it back in his phone, or will it lock to his provider or something?

If the phone in 'unlocked' it shouldn't be a problem. Otherwise I think you're limited to a single carrier.

You can try.

You can't activate a new phone with a SIM that is from another carrier.

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