Yes, that is possible.
Call the loyalty hotline 027301300 for them to process your upgrade or downgrade.
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Hi aimi.jiero If you have an iOS or Android devices, download the GServices app and manage (upgrade/downgrade) your account from there. I hope this helps. Have a good day.
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yes it is. just be reminded that if you are still under your lock up period, you will have to pay some fees. and notevenfollowed is right. call up the hiotline to check the status of your acct.