T-Mobile promotion offers new and existing customers a free third line

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T-Mobile’s Deals page revealed today that the carrier is offering a free third line to new and existing customers. The promotion is cleverly titled 2019 Spring into Summer 3rd Line on Us and is available from T-Mobile’s retail locations and website. Here’s how it works. If you’re a new subscriber, activate three new voice lines on T-Mobile ONE, and the third one will be free. Existing T-Mobile subscribers must have one postpaid T-Mobile ONE voice line active. If they are subscribed to a different T-Mobile plan, they must first switch to T-Mobile ONE. Then, two more voice lines must be activated …

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