Direct Carrier Billing for Google Play is temporarily unavailable for Postpaid, Prepaid and TM today due to a system issue. So that is the reason why you can buy gems for now
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if you really want to buy gems use other payment options po
may nabibili na andoid card ata tawag dun, diba sa ios may itunes card na tinatawag sa android meron din po pwede ka makabili ng gems gamit yun
or pwede ka kumaha ng prepaid master card sa mga bank, it works as credit card yun lang kailangan may laman account mo.....