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

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 features. Occasionally, targeted users may get free trials of ChatGPT Plus, some requiring a payment card and auto-renewing unless canceled