To cancel your AT&T account you will need to call into support. But before, you should find another provider and check to see if your number is portable, meaning you can bring the phone number to another company.
The issue in GetHuman-brycebea's own words
The problem: I forgot my roblox pin and you cannot memorise it and I was wondering if you know my roblox pin
GetHuman-brycebea did not yet indicate what ROBLOX should do to make this right.
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