Will an unlocked iPhone work for any phone company network?

I would like to stay with Boost Mobile after I bought MY VERY OWN iPhone. If not, I will go with sprint. The problem is I pay my own phone bill and I'm starting work soon. This is why if I can stay with my current phone company I will. If not I will just buy a cricket iPhone. I was looking into getting an unlocked Samsung Galaxy s4 at first, but they're more expensive. So will an unlocked iPhone allow me to use it with my own company choice? If so which ones?

A lot of cell phone carriers require you to use one of their phones. Boost and Sprint both require this as do Verizon and Virgin. Most GSM carriers allow you to use an unlocked phone.

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