BB 8830 World Edition - in Brazil + not getting email nor able to call US

Although I signed up for the Global Data Plan, I can't make/receive calls (I'm in Rio) nor send/receive email.  Help!!


The Network Mode was set to Global when I arrived and I've tried switching it to GSM, turning the phone off then back on, but no success.


I used the same phone in Sao Paulo last year but I'm currently in Rio, if that makes a difference.


Thanks for any advice you may have! 

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