There's a lot in the news lately about phone hacking. How do we protect ourselves from these invasions of privacy? What is Verizon Wireless doing to help protect its customers from phone hackers?
same way you protect your pc
1. dont download anything you dont trust
2. dont go to any website that you dont trust
3. use common sense
4. dont put any sensitive info on the phone !!!!!!!
5. when in doubt see 3 and 4
Are you talking about cloning, or a virus-type thing?
I wouldn't worry about cloning, as it's very hard to do. They would need to be near you, and would need your MEID/ESN number and your phone number to do this.
As far as viruses and hacking that way, as the others said, just be careful of which apps you download. There was something over on the Android forums about a new virus in PDF format - watchout for that. There was also a report of a virus where when you went to download an app, it took you to the market in the browser. The market will NEVER make you download something from a browser, so if you encounter that, do not select anything.
Most of what I've read recently hasn't been about hacking the phone itself. It's been about hacking into voicemail to read (and often delete) your voice mail messages. That was the big issue with the tabloid scandal in the UK.
Still, the normal cautions apply...make your voicemail PIN something that you can remember but would be hard for someone else to guess -- and preferably different from others like your ATM pin etc.
And like others have said already, change it reasonably often, and don't trust it to ANYONE.