I took advantage of the Free until 2015 1GB Tablet data plan T-mobile is currently offering. It was my understanding that this plan would be totally free for Voice plan customers who add a mobile internet device line. However I saw that I was being charged $10 a month so I contacted customer service and they informed me that there was also an additional $10 add a line fee for Mobile Internet Devices. Is this really true? Then the data plan is not really free.
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