- What is International Data pass? We actually have international roaming passes where you can get high-speed data while roaming outside the United States and unlimited $0 calling to other countries including US. Here are your options: - 512MB (1-day pass) - $5 - 5GB (10-day pass) - $35 - 15GB (30-day pass) - $50 Would you like to add an international pass today? ------------- - How to add international data pass? You can easily add this data pass using your T-Mobile app! Here's how: - Access the T-Mobile App on your device. - Tap ACCOUNT. - Tap ADD-ONS next to the Primary Account Holder's line. - From the Plan Details tab, scroll down and tap Manage Data & Add-ons. - Scroll down and select the check box next to the pass you want to add. - Select Continue. - Select Change Date to chose a start date for your pass. - Click Agree & Submit.