I created this contact card (and made it a favorite on my iPhone) to quickly check My T-Mobile data usage. It’s a short code phone number (#932#) that you can call, not text, and it will instantly tell you your current data usage for your current billing period. It isn’t real-time usage but appears to be delayed by no more than 15-20 minutes best I can tell. The first number is the amount of data that goes towards your plan, the second, is your total amount which would also include your binge on data and any data that doesn’t count towards your plan. The card link below is directly importable into your iPhone or Android device’s contacts.