ChatGPT offers a free plan that 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 free plan that anyone can use without time limits. Occasionally, targeted users may get a free trial for the Plus plan. Some of these trials require a payment card and will auto-renew when the trial ends