A Second Line provide a second phone number, and voicemail without having to create another account. This is applicable to dual SIM phones only. When you need to select the Second Number, this selection should show up in the options of the dialer. The Second Line has a phone number, and separate voicemail which could be beneficial when you need to separate contacts. You should also be able to select contacts which the second line will be used. The second line does not have a data connection. If you need a phone number with a dedicated data connection, you will need a secondary or new account. The Second Line is $10/month.