there is 2 g on my mobile but i can not access my internet

last mont i can use my mobile dada without questions. I did not change anything on my Iphone. My data run out when there is 9 days left for my last month plan. I know it will work again after 7th, Sept after monthly fee is charged. But today is 8th, Sept i can not use my data. When i login my account, i can see there is 2G left. What happened?

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