ChatGPT offers a permanent Free plan anyone can use with basic access....

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 with basic access. Occasionally, targeted users get a free trial of the Plus plan, which may require a payment card and will auto-renew when it ends