The best part is that, when you invite your friends to join with their trial,you also get 1 month free into your account. You can get 24 hours of free vpn access with Safer VPN. If you feel comfortable with this,give them your number and get a week free vpn account at Astrill. However, you have to sign up at their website,even you need to put in your phone number.This is used for verification purposes.