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iPhone OS 2 - Wikipedia
First Look: iPhone 2.1 - Macworld
iPhone OS 2.1 review - iMore
IPhone OS 2 - Apple Wiki | Fandom
iPhone Bluetooth Support By Model: EveryiPhone.com
iOS 17.2.1: What You Need to Know About Apple's iPhone Update
Apple's iPhone 2.1: The Bug-Fix You've Been Waiting For - WIRED
Major architectural changes suggested by iPhone 2,1
Apple releases iPhone 2.1 update - Macworld
About iOS 17 Updates - Apple Support