I'm trying to download something. But I want to use WI-Fi I don't know my neighbours wireless pass code and I'm not sure if my neighbours do have WI-Fi. I'm thinking about using the unsecured WI Fi. Is it a good idea. Will I might get a virus. I would like to know if its safe and if its a good idea.

All unsecured networks may be safe or not safe, because some people dont know how to keep a secured network and some knows but they might hack your smartphone data if they are professionals in hacking.

If you are on unsecured network browse at your own risk one more thing is that you mush have installed a good antivirus in smartphone if you are on unsecured network you will safe. Moreover totally depends on what you are browsing and downloading, say you are downloading any files from mail that's quite natural or you are copying the shared file that might be risk because the file is network may or may not contain virus.

If your device is loaded with antivirus it will safe for you and you can access any type of file or website, it warns you if that is an inappropriate file. One more important thing is you need to update the virus definitions atleat once in a week.

Tip :- dont list your passwords, userid's and credit card numbers and other credentials in you smartphone or in email or in any cloud storage

The best free antivirus is that Avast in my point of view that is the free best antivirus till now and I was using this avast free edition since version 5 and the avast is the major antivirus programme and using since 3 years, I personally experienced a good performance of the security programme.

They provide 1 year license as well which is free of cost and provides upgrades and updates for a year. It scan engine, virus database is awesome and user interface is very nice where one can easily understand the programme and use it thoroughly.

Eset also provides a god antivirus programme, but I didn't find that much performance when compared to Avast antivirus and so many antivirus programmes are available on the Internet. AVG is also one of them and  provides free license for lifetime when I was using it a 4 years ago and problem with this is, If a infected file found in compressed file i.e. zip or rar file, this antivirus programme deletes all the data means the complete rar or compressed file will be deleted and so other important files in it will be lost.

That was the time I was searching for a good antivirus and I found Avast. 

Symantec Norton is awesome which I used a Trial version for 30 days. If wanna buy I would by the Norton Internet Security or Norton 360.

Better buy full version of antivirus programmes for a better protection