ChatGPT offers a free plan that anyone can use with no time limit....

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 with no time limit. Occasionally, targeted users get free trials for the ChatGPT Plus plan, which may require a payment card and will auto-renew unless canceled