Hello lucienlu, and thank you so much for reaching out regarding this matter. I'm sorry to say that your MyT-Mobile account is closed when your line is canceled, so online billing or payment will not be an option. Your final or revised final bill will be mailed to the mailing address was last associated with your account. Depending on the final balance due, a deposit is returned to the account to cover that amount first - but any remainder is definitely something we'd want to work with you to return. The Support Community is a user forum, so moderators here aren't able to access individual accounts, but we do have a few ways you can reach out for assistance so that we can go over any balance owed or credit remaining with you! Internationally, you are still able to call us at +1-505-998-3793, however, this will incur long distance or international charges if dialed from anything other than a phone with an active T-Mobile SIM. If you prefer, you can also contact our excellent T-Force team through Facebook or Twitter - through those social media channels we are able to take your account information and PIN or password to verify your account, and we can review the final balance with you and determine any next steps necessary. Thank you again, and I hope you had a safe journey!