According to the source, in 2015 an iPhone cost 4 BTC, and now 1 BTC buys 122 iPhones, indicating a sharp shift in BTC purchasing power relative to consumer electronics (source: user-provided social media post dated Oct 5, 2025). Based on those figures, BTC’s iPhone-denominated purchasing power rose by about 488x since 2015, with an implied ~86% CAGR over roughly 10 years, calculated as 122/0.25 and (488)^(1/10)-1 respectively (source: same post). For traders, the data supports the long-term store-of-value narrative and may bolster BTC dip-buying sentiment, but the post does not specify iPhone model or USD pricing, so it does not provide an immediate price target or trade setup (source: same post).