Just had a "Blocked call" on my Iphone 4 yet never blocked anybody? Anybody know why this is?

Discovered another issue with the Iphone in general a few weeks back. It froze during a call and I could not hang up. Because it's touch screen and you can't take the battery out it almost ran my credit down as I'm PAYG.

It's probably from a landline with a withheld number.

If the phone ever crashes, reboot it by keeping both buttons pressed until you see the Apple Logo. I had this happen to me once, it will hang up.

That's what I done. Good job it worked.

I too had this a couple of days ago and wondered if it was a person with withheld number turned on but never found out who called me as I had a few of them.

"Blocked" on an iPhone does mean the Caller ID was not available, most likely withheld.