As a foreign visitor in the US, I bought a prepaid GoPhone Card at BestBuy with 50$ refill with a with a 5 GB monthly plan and a 90 day expiration. When I saw that I had used most of the data I bought a second refill card with 90 day expiration at Walmart and registred it on my number. However, my remaining data did not increase although I could see that I afterwards had a current balance of 50$. I gave up trying to contact ATT by phone and could not use my spent money on data before I left the US. I am disappointed and wonder what I did wrong and how I should have done to expand my data allowance without buying a new GoPhone card with a new number.
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