T-Mobile today announced it will beat the trade-in value offered by any of its competitors. The company explained that it plans to track the market value of most phones and will offer the best possible price for trade-ins. However, if a customer finds a better trade-in price from a national carrier, T-Mobile will match the price, plus cover the difference, and add an additional $50 in credit. The offer starts September 17 and is for a limited time. T-Mobile customers will need to act quickly, as they'll have to contact T-Mobile within seven days of trading in an old device.


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