There is no contract on prepaid. Your service will stop working if there is no money on your account and your account will be closed if your account balance is $0 for more than 60 days. So if you are asking how to cancel, you are correct that not putting money on your account will cause it to cancel. Porting your number to another carrier will also cause it to cancel.
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I was a treveler in June. I used prepaid usim at At&T and now comeback home. I want stop this service. I paid by credit card so you paid for my card in July. I would like to get a refund for the July fee.