If you’re interested in using ChatGPT-4 on your iPhone, you have several options:
Opting for a costly subscription (ChatGPT or iOS apps that provide access to ChatGPT-4)
Utilizing GPT-3.5, which is available for free, either via OpenAI´s website or through third-party apps (e.g., Poe.com)
Employing OpenAI’s API, which grants access to GPT-3.5 by default, but allows you to join the waiting list for GPT-4 (Good luck with that, as some people wait weeks or months, while a lucky few only wait days)