You have to have applied for a T-Mobile US service between September 1, 2013 and September 16, 2015 in order to qualify for this offer of credit protection from Experian. Fortunately/unfortunately, I started my service with T-Mobile long before this.
2007 Honda Fit $4,400
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Apparently Experian was hacked and 15 million t-mobile customer records, including SSN are floating through the dark webs.
http://www.t-mobile.com/landing/experian-data-breach-faq.html