Betternet

Its Free, No ads & No limits, but sometimes connectivity is poor, and video streaming is slow on this app,it could be a good choice if  others apps are blocked by your telecom operator. and Skype may not work with this app.

supervpn

This app holds 4th position for its fast connectivity, but there are limitations in free version, your connection lasts only for 1hour, and there are lots of ads, other than this everything works fine with this app, except Skype.

Speed vpn

This VPN service is pretty fast & connectivity is good, gives you choice to chose server but according to user reviews this app failed to unlock some calling features in some countries, so what i have concluded if you only want to browse some sites, it could be a good option, but won’t work with all apps as you are expecting.

cloud vpn

This is one of the best VPN apps in playstore, its free , unlimited & connectivity is super fast, for me it gets connected within 3 seconds. all apps works flawlessly and i can leave it connected as long as full day. interface is simple and a single tap is required to connect.