Introduction
The Apple iPhone 4s, launched in October 2011, marks a significant milestone in Apple's lineage of smartphones, carrying forward the legacy of the iPhone 4 while introducing several pivotal advancements in technology. Now discontinued, but once celebrated, the iPhone 4s was notable for its introduction of Siri, the voice-activated assistant, and for being the first iPhone available on multiple carriers in the U.S. Its design, features, and overall performance were regarded as benchmark achievements in the smartphone industry at the time of its release.