To cancel your subscription click the VPN Administration button on the left hand menu of https://my.liquidvpn.com/clientarea.php 
Click VPN Administration 
Click the service you want to cancel
Click Request Cancellation
Choose to cancel immediately (takes up to 24 hours to process) or at the end of billing period
Either option will stop your subscription before being billed again.

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Yes, LiquidVPN fully supports bittorrent and P2P on all of our servers. We will never censor P2P...
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The short answer is yes However we have not released our mobile VPN client yet so you will need...
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Yes you can. You will need to do it from your account details screen...
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We accept the following currenciesPaypal, Credit Cards, Cash, Bitcoin, Litecoin, Peercoin,...