If you're working with a budget, or prefer not to part with a penny, there are a number of reliable free VPNs out there.
However, most of these services come with restrictions. You'll likely have to put up with bandwidth restrictions and a monthly data cap, and fewer servers in fewer locations. Free providers often struggle to unblock the likes of Netflix, too, making them less than ideal VPNs for streaming. Oh, and since these VPNs have to make money somehow, you might be inundated with ads—or, if you're using a particularly unscrupulous service, your personal information might be sold off for profit.