My old iPhone was fine for the job. Sure, it would need a new battery in time, but apart from that it had years more life in it... mostly just a sequence of steady incremental improvements... incremental changes and price rises.
The arrival of the smartphone signalled by the launch of the first iPhone in 2007 represented a sharp discontinuity in the evolution of mobile phone technology... until the technology (and the market) matured and incremental changes became the rule.
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