Since my phone service is prepaid, there will be a need to have a way to pay for international calling, or when calling 411. This is where the funds pool will come in. You would add funds to your account in increments of $5. Therefore, you can add $5, but not $13. Instead of $13, you would either add $10 or $15. The funds pool is applied to the sub-account. This means if you have a family, and your child has a secondary account, then they will not have access to the funds pool on the primary account. Funds must be added to that secondary account. When you drop below $10, you would receive a notice. You can also choose to auto-add an amount when the pool drops below $5 as long as you have either a credit card, or PayPal account added to that particular account.