When you sign up for a paid subscription with GiantCampaign, you will be charged based on the number of contacts you want to store. Simply select the maximum number of subscribers you need, and you will be charged according to the tier you choose. Your plan will be determined by the number of subscribers you have, as long as you stay within your sending limit. If you need to send more emails, you'll need to upgrade to a higher tier that matches your sending requirements.