PAYMENT ARRANGEMENT

You can follow these few steps for setting up a payment arrangement on your T-Mobile app:
1. Open the app and tap BILL.
2. Tap Set up a Payment Arrangement.
3. Tap Continue and view the Amount.
4. Tap Payment Method. 
5. Tap Continue, read the Terms & Conditions and tap Agree & Submit.

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T-Mobile app (preferred method)
 
Open the T-Mobile app.
On the Welcome screen, tap Get a T-Mobile ID.
Enter your registration information and tap Sign me up.
Enter the code from the text message we sent to your mobile device and tap Next. Note, if registering from your mobile device, the app may automatically confirm your phone number.
Follow the on-screen steps to complete your registration.

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 Pay your bill
 
Open the app. If you don't have it, download it now.
Tap BILL.
Scroll to and tap Make a payment.
Select the amount to pay, the date to make the payment on, and the payment method.
Tap Agree and Submit.

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EIP payments
 
Open the app. If you don't have it, download it now.
Tap BILL.
Under the Make a payment option, select More payment options. 
Select View device payment plans.
Select the device /line that you want to make a payment for.
Select Make a payment and follow the instructions to make an EIP payment.

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T-Mobile app ( Billing Address )
 
From the app, tap the MORE tab.
Tap Profile settings > Billing and Payments.
Tap the arrow next to the address to edit.
Tap Save changes.

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T-Mobile app ( E911 address )
 
From the app, tap the MORE tab.
Tap Profile settings.
Select a line from the Select Line drop-down.
Click Line Settings > E911 Address.
Enter the new E911 address. This address should be the primary place where you use your Wi-Fi Calling, LineLink, or other services on the line.
Click Save changes. Repeat this for any other lines that moved.

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T-Mobile app

Open the app.
Scroll to and tap Track shipment to get the latest update on the location of the package.
Or
Open the app.
Select More.
Select Contact Us.
Scroll to and select Check order status.

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Check rebate status

Go to https://promotions.t-mobile.com/  and select Continue.
Select Continue.
Login with the T-Mobile ID.
View the Reward Tracker. This shows all previously submitted promotions.
Select View on the needed promotion.
If the submission status displays as Approved, the customer's rebate has been approved but may not have been sent yet.
Make appropriate changes and select Save changes.

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Work Perks Verifying

Go to http://my.t-mobile.com or open the T-Mobile app and log in.
On My T-Mobile, choose Profile from the top right menu. In the T-Mobile app, click More and then Profile Settings. 
Select Employment Verification.
Fill in the required information; Company name, First name of employee, Last name of employee, work or personal email address, confirm email address, mailing address and MSISDN.
Click Submit Information. 
If you see Employment verification verified, you're all set and no further action is needed.
If you see More information needed, you'll need to upload a recent pay stub to complete employment verification. Upload the file and select Submit Information. You'll receive an email update about the status of your employment verification request within 24 hours or you can check back on My T-Mobile or the T-Mobile app within 24 hours for an update.
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Add or Remove features

It seems like you are away from your desktop I will leave a self-help options for us to Add or Remove Features in your account using the T-Mobile App;

Open the app and tap Account.
Tap the picture of the phone.
Tap Plan details tab at the top.
Tap Manage data & Add-ons at the bottom.
Select the plan or service, click Continue.
Review the summary and click Agree & submit.