Hola premium allows you to use the VPN on your iPhones and iPads etc! IN ORDER TO REFER A FRIEND JUST USE YOUR OWN EMAIL ADDRESS AS THE REFERRAL!
In order to get free Hola Premium you have to use one of your emails to 'refer a friend'. Here is how you do this:
1) Go to the 'https://hola.org/' website and select in the top right of the page 'Get Free Premium'.
2) Enter one of your emails, and select send. Do not open the email until you have logged out of your current Hola account.
3) Go into the email that you delivered the message to, and click on the email that you received and select 'Accept Invite'.
4) After you have made an account which takes five seconds, just by filling in your email that you delivered it to and confirming a password, click on the top right where it says your email address, and select my account.
5) There should be an active one month subscription, which you can keep redeeming by sending it to random email addresses you may have and confirming them.