Many iranians recommend on twitter: Unseen Online Probably because its free and the team there is actively working to bypass blocks gov is making. They helped Emirates, turkmenistan and uganda in past - Not bad for a team that makes free app Annoying ass, but I guess it's understandable for what they give back that helps thousands of people now.
The majority of free VPNs include advertisements, but there are those that truly function. I'm now using Free VPN Unseen Online, and it's functioning well. However, it is entirely up to you; it would be preferable if you paid for a VPN subscription.
That should definitely not be happening. Deb links usually work on these first one for me. Try it with a VPN for shits and goggles. One I recommend is called Unseen Online from the play Store. You have to hit Back for two ads, buy other than that it's stable. Might be yours isp.