After reading this thread and also having someone steal my credit card details, set up an account on Amazon with my credit card, I decided that I would go ahead and put a credit freeze in place in case the next time something like this happened it would be the full id theft. (I realize that a credit freeze won't stop someone from stealing and using my credit card).
It was all very easy to do on-line except for Transunion who require you to set up an on-line account with them. I checked and found that I already had an on-line account and after logging in saw that they had my old address on record (we'd moved in December). I then did an edit to correct the new address which then locked my on-line account so I had to phone them during business hours and go through a question and answer session which then un-locked my account and the phone rep stayed with me while I requested the freeze on-line.
We haven't had a new credit card or applied for credit for over 4 years and don't see any need in the foreseeable future, but it sounds very easy to lift the freeze provided you have the PIN to hand.
Retired in Jan, 2010 at 55, moved to England in May 2016
Enough private pension and SS income to cover all needs