All of that info can be found in the T-Mobile app and online at mytmobile.com.
Hey there! Did you find the information you were looking for? tidbits is correct, you can find your EIP balances on the T-Mobile app or on my.t-mobile.com.
Here is the direct link that you can log into your account with. https://my.t-mobile.com/billing/eipdetails.html
Manage your T-Mobile account