I've turned off the mobile data on my phone, but somehome it seemed to have leaked and costed me data usage. I'm 100% certain that I've never accidentally turned it on, and have been using wifi only.
Is there a USSD code / short code to key in on dialpad to manually bar data usage from the account?
In fact, I'm also looking for a complete list of USSD codes available on O2 but couldn't find any meaningful links.
I thought the question was asked and answered here?
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