No, your TextApp number and any remaining credits you haven't used won't expire as long as you have an active subscription.
Here's a breakdown:
Active Subscription: If you have a subscription plan that's currently ongoing (not paused or canceled), your number and credits will stay active.
Credits Don't Expire: Any unused credits you purchase will remain in your account for you to use later.
Tip: You can check your subscription status and remaining credits directly within the TextApp.