How to verify an unlocked SIM?

T-mobile finally sent me my SIM unlock instructions. 
I'm supposed to dial ##782# from the dial screen and hit "call" and it's supposed to bring up a text box where I enter a long string of numbers. At least that's what it's supposed to do. 
However, when I hit "call" it just closes the dialer and brings me back to the "contacts" screen O.o
How do I know my phone is unlocked? I'll be traveling over seas this summer and would really like to get this taken care of beforehand. 
Phone is Lumia 810
Version 1.7.0.173
Accessories agent 1.0.5.2
Feedback to Nokia 2.2.0.9
Nokia First Use Experience 1.3.0.0
SmsVCardReceiver 1.0.0.8
Warranty Registration 1.1.0.4
SIM Unlock 1.0.0.5
Solved!
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scoobyman wrote:
It should be 8 numbers long and if you insert SIM from network other than T-Mobile/Orange/EE you should get a screen to enter it together with the notification of number of attempts remaining (maximum of 10).
You should key in ##782# without SIM then hit call and if device is unlocked you will get screen with "Your device is already unlocked".
I unfortunately don't have any other SIMs around that I can try.
But when I dial ##782# when my SIM is removed, I get a message saying that my SIM is either removed or invalid and my only option is to make an emergency call... :/

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