Iphone 6+ Won't Turn On. How to activate old Iphone 5?

So, my iphone 6+ won't turn on at the moment. But I have my old Iphone 5 still and is working perfectly. Is there anyway I can just switch the sim card in my Iphone 6+ and into my old Iphone 5?

If not, how would I be able to activate my old iphone 5?

If you have the same phone company as previously just put the SIM card in, if not you need to get it unlocked then you can put it in

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