I've been considering getting a prepaid phone from Verizon (I live in the U.S.), but I don't like any of their phones. I'm more of a "let's build a computer, install new cooling solutions, and overclock it!" type of guy, and the idea of getting such a weak phone is a little sad. 
If I was to purchase an unlocked smart phone with much better hardware, could I put the SIM card from the other phone inside the new one, and then still use it for texting/calls and such? Is the phone number connected to the SIM card? How does it all really work?
Thanks in advance for answering such a noob question. I'm just new when it comes to phones (never owned a smartphone before), and I like to know enough to wrap my head around it before I purchase anything.

If I was to purchase an unlocked smart phone with much better hardware, could I put the SIM card from the other phone inside the new one, and then still use it for texting/calls and such? Is the phone number connected to the SIM card? How does it all really work?
Thanks in advance for answering such a noob question. I'm just new when it comes to phones (never owned a smartphone before), and I like to know enough to wrap my head around it before I purchase anything.