If I buy an unlocked Motorola RIZR Z8 will it work in the US?

i am pretty sure it will work

Yes it will work. So go ahead and buy it!!!. It has the necesarry 2 bands (850/1900mhz) for it to fully work in the US (canda & mexico too)

Yes. An unlocked Motorola Rizr Z8 would definitely would work in your area with your own SIM card. But make sure how safe was the phone unlocked. Certain unsafe unlocking methods would give you problem while working with other network SIM cards. So, it is safe to get a network locked mobile phone and unlock it yourself safer and easier using unique unlock code. You can get the unique unlock code for a Motorola Rizr Z8 from TheUnlockArena.com at affordable cost with an easy unlocking guide. Good luck.