According to the source, in 2015 an iPhone cost 4 BTC, while in 2025 one BTC buys 122 iPhones, highlighting a dramatic shift in BTC’s real-goods purchasing power that traders can benchmark over cycles for momentum signals, source: X post dated Oct 5, 2025. Using Apple U.S. MSRP of $649 for the iPhone 6s in 2015 and $799 for the current base iPhone, that ratio implies BTC rose from roughly $162 per coin to about $97,478 and delivered a 488x gain in iPhone-denominated purchasing power, source: Apple Inc. product pricing archives and calculation based on the source post. This long-horizon outperformance versus a stable consumer electronics basket reinforces BTC’s fixed-supply, store-of-value narrative that often coincides with bull-phase liquidity expansion, a context traders can incorporate into position sizing and trend-following frameworks, source: Bitcoin.org consensus and halving schedule documentation. To validate ongoing demand, traders should monitor BTC/USD trend and spot Bitcoin ETF primary market net creations/redemptions as reported by issuers and filings, source: issuer flow reports and U.S. SEC fund filings.