Does updating ios update your firmware?

I have an iPhone 4s with ios 5 and I wanna upgrade but i'm not sure if it'll update my firmware and I need it to stay the same so I can unlock it. By the way my firmware is 2.0.12 and ios is 5.0.1

Just so you know iOS is also called firmware, but I know what you mean. The modem firmware & yes in some (usually most) cases updating iOS updates the modem firmware.

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