After downgrade from iOS8 to iOS7 will my iPhone that already unlock sim back to lock?

Due to mistakenly upgrade to iOS8.0.2, want to get back to iOS7.1.2 because only that version can jailbreak (for now).
But do this will it also reset the unlock I have done before. (the unlock which allow me to use any sim card).

You can't downgrade from iOS 8 to 7. As far as the unlock it depends on how it was unlocked. If software then likely that would go away, if through a unlock service, then likely no, that'll stay for life.

You can't downgarde from iOS 8.0.2 to iOS 7.1.2 As far as the unlock it depends on how it was unlocked. If software then likely that would go away, if through a unlock service, then likely no, that'll stay for life.