I would advise against typing in *#06# and use this as a last resort if you have forensic tools at you disposal.
Why exactly? Entering *#06# makes no changes to the handset, your simply asking it what it thinks it's IMEI is.
The only time it has ever not worked for me is if I enter a character incorrectly and press clear and then continue the string. As far as I've seen if you enter it correctly (without ever pressing clear or back etc.) it will automatically show you the IMEI and you wouldn't have to press dial or anything else.
There should be no problem entering this string into any handset… Emphasis on the "should".
Although I've never had any issues when I have use *#06# it doesn't mean I wont or that every handset will react the same way.
My advice is just that… advice. If you have forensic tools available that have been tested I advise using them first.
I was able to get a screen shot of the IMEI using the *#06#. I have also sent an email to Cellebrite (last week) and I am waiting for an official response from them on the software not reporting the last digit correctly.
THANKS EVERYONE for you help.