Not able to access internet while traveling international


    I have a T-Mobile sim card and a Verizon Galaxy S7 phone.  I have the global data plan with T-Mobile.  I have been traveling throughout Europe for the past 10 days without any problems until I arrived in Odessa, Ukraine today.  Upon entering Ukraine, I received a text message fromT-Mobile stating Ukraine is one of the countries covered in my global data plan.  However, my data is not working.  I am unable to get onto the internet without using WiFi.  I can still send and receive texts.  I have not changed any settings on my phone from the previous European countries I visited and Ukraine.  Which steps do I need to take to have my data working?  Thank you for your help.

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