Can i use vpn super shield like for proxy in my smart phone ?

Well, you can use it, but the free proxy apps are not secure and you are never sure that it does not keep your logs. Moreover, after a while of use you are asked to update for more features and that requires payment of some amount. So, it is better in the first place to use a paid premium vpn which also allows you to use multi-logins which means with one account you can use it on 4-5 different devices. They are more secure and also provide support to the customers, if anything goes wrong. Free ones are filled with ads too.
 
VPN's aren't all created equal so it really depends what you are looking for. As the other poster mentioned, free isn't always the way to go. You might get stung later on to pay and the ads are super annoying. Do some research, there's a lot of Android specific info out on the web https://securethoughts.com/3-best-vpns-android/ and 15 best Android VPN apps - Android Authority also on this forum. I personally use Vypr but I have an account that I use on my PC as well as my phone. It works pretty well.