Another really good VPN to use which gives you a stable three bar just as good or possibly even better than cactus VPN is the OkayFreedom vpn. It's extremely simple to set up. You get 500 mb of traffic which resets each month which.. is an ok amount I guess. Thanks to AuXilary- though I can get an infinite amount of premium codes worth of 5 GB of traffic for free... :] don't ask me how.
Also about Cactus, multiple people can be on Cactus at the same time on the same account. You just have to connect to a different place.