I don't use mobile so I don't pay much attention to that aspect of the game. BUT if memory serves correctly I think players now need to be verfied to purchase credits. This was recently changed due to scammers taking advantage of the credit system. I'm not 100% sure how accurate the above information is but if you go to the official Splinterlands discord and ask in general chat someone there will likely have a more accurate answer for you.
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Ok that would be bad for me because I do all my purchases in the appstore