The script will allow you to have a mobile version of the money vault (from the Arena War Business add-on), which has 10 slots with a capacity of about $2 billion each.
To open the menu, you need to find a contact on your phone with the name "Mobile Money Vault", after dialing which the menu will appear.
Requirements: Scripthookvdotnet NatveUI ifruitAddon (available in the archive)