ChatGPT offers a permanent Free plan anyone can use without time limits....

https://smoothdecorator.com/how-do-i-check-if-im-about-to-be-charged-for-chatgpt-plus-on-android/

ChatGPT offers a permanent Free plan anyone can use without time limits. Occasionally, targeted users get a free trial of ChatGPT Plus, which may require a payment card and auto-renews after the trial ends