how do i set up a payment plan
Call T-Mobile or visit a store. Also try the T-Mobile app. Under Billing and Payments there is a payment arrangement option if eligible.
Or or are you talking about a device payment plan like an EIP? In that case you can still go online or call or visit a store or even contact T-Mobile on Facebook or twitter.
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Manage your T-Mobile account
Use the T-Mobile App or your My T-Mobile account
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