What apps do you use most in your mobile phone? Share it with me please.

I use most frequently is Skype. Because of my job, I aways need to make international calls. I save a lot of money when using Skype.

For fun, I watch videos on Youtube. I have my own Youtube Channel. Sometimes I will upload some videos clipped by myself but no one interested in...

Do you have any other helpful or funny apps to recommend?