A sub-account enables hierarchical management of your resources. You can use sub-accounts to distribute numbers and applications among various sub-organizations.
Subaccounts use the credits from the main account and hence do not need to be recharged separately. You can create and manage subaccounts using either the API or the GUI.
Note: You can rent or search for numbers only under the main account. You can associate numbers with a sub-account once it has been rented.