Hello! Yes, you can apply for PLDT Prepaid Fiber even if you have an active subscription with Postpaid. It's possible to have both types of subscriptions with PLDT. If you're considering terminating your Postpaid plan and trying out the Prepaid Fiber to test its reliability, you can definitely do so. Just make sure to coordinate with PLDT regarding the termination process of your Postpaid plan to avoid any issues. Testing out the Prepaid Fiber can give you a firsthand experience of its reliability and performance. If you have any more questions or need assistance with the application process, feel free to ask!