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

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 a time limit. Occasionally, targeted users get a Plus trial, which may require a payment card and auto-renews unless canceled. To check when your trial ends, go to Settings - Subscription