Can I switch to an unlocked iPhone?

So currently I have an iPhone 5s thru Verizon, but I'm wondering if I were to buy an unlocked iPhone 6 from Apple, would I be able to just take the sim out of my 5s and put it into the 6? Would it work perfectly fine/normal, and my upgrade date wouldn't even have to be moved up either?

No reason why not

Not exactly in the case of Verizon. The SIM they provide is for data use, not phone/text. You'd have to go through them in order to get that done.

No clue about the upgrade date.

Not with Verizon. Verizon uses the old CDMA cell system, instead of the modern GSM system used by everyone else. And CDMA requires a special version of the iPhone that is available only from Verizon. Apple stores do not sell it.

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