I have collected some user agents of different iPhone OS(2.2.1,
3.0.1), and I want to use different css file in the different
versions.

How to differentiate them for different web versions?

iPhone 2.2.1's User Agent:
Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us)
AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5G77
Safari/525.20

iPhone 3.0.1's User Agent:
Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0_1 like Mac OS X; en-us)
AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A400 Safari/
528.16

There are 4 differences:
iPhone OS 2_2_1
iPhone OS 3_0_1

AppleWebKit/525.18.1
AppleWebKit/528.18

Version/3.1.1
Version/4.0

Safari/525.20
Safari/528.16

Which should I choose to differentiate in the web?

Ps. Sorry for my bad English.

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