Plan will not auto-renew. You can run unlimited polls for 60 days - you're only limited by the number of SMS responses you purchase. After that you'll still have access to results. Reactivate whenever you like.
Unlimited Polls
Unlimited Online Responses
SMS Responses (change to see updated price)
You'll be notified when you're close to using up all of your responses.
More responses may be added in packs of 500.