Should I cut my sim card or just buy a new one?

So my dad is getting the iphone 6 for Christmas and is giving me his barley used iPhone 5S. The problem is right now I have the 4S which has a micro sim card, while the 5S has a nano sim card. I watched some videos on youtube and know how to cut the sime card down to the correct size. Or should I just buy a new sim card for my phone and get all my information back by syncing my icloud with the new phone.

*****ALSO, what would be the difference between cutting down my old sim card and using it and buying a new sim card and syncing the used phone with the icloud?

Well. Cut down the sim from a professonal. As i will not recommend you to do it. As by syncing you will only sync contacts and other stuffs. But your personal contact number is that sim. So use dat sim.

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