When does apple install new firmwares on devices?

just wondering since i like my jailbreak and ios 7.0.5 has just been released....and in 15 hours im replacing my iphone for warrenty.(yes yes it will be empty and restored when arrived)

so yeah, when does apple install new firmwares on new and or/refurbished phones?

lordofthereef said:

I have read (recently) of people replacing their 5 and still having 6.x.x on it. My feeling is that replacements are shipped with whatever was the newest firmware just before shipping. From there they are never updated again, except by their future end user.

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sounds good. i guess im save for less then 24 hours...just restored my iphone 5s to get the jailbreak off....now ios 7.0.5 is installed. hope for the best haha.

7.0.4 is installed on my replaced iphone