unblock sim pin

edgum@hotmail.com

    I am currently traveling outside of the US and am currently in roaming status. I tried to change the PIN to prevent my children from playing with the phone when I am not around to reduce roaming charges. Now I have a message on the Lock Screen that says "PIN blocked. Contact your service provider to unlock your SIM card. Emergency calls only."  What should I do and how can I contact T-Mobile when my phone is blocked from usage.

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