How can I improve my security?

[amlc]

Hi,

I wonder how to improve their safety on the Internet.
I used blackVPN. Encrypt disk using TrueCrypt with AES.
I use XMPP chat encryption.
I use Windows Server 2012 as a workstation.
I use GMail. Maybe should I change?

I have a Nokia Asha 200 at T-Mobile. Can I encrypt calls and SMS?

How can I improve my security?

Any suggestions?