Did T-mobile charge me for using wi-fi on my android smartphone?

lykomg1337

New member
I've looked up answers saying that wi-fi usage is free of charge. I have unchecked "use packet data" in my network settings; that makes it so I wouldn't be using 3g internet, right? My parents paid $60 on the first payment. I just checked my balance and the next payment says its $90. I'm scared I'll get in trouble for this. How did the payment amount go up?
 
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