You didn’t think T-Mobile CEO John Legere was going to take a new study that trashed his company’s wireless network lying down, did you? RootMetrics this week unveiled a major new study of American wireless carriers that ranked T-Mobile’s network dead last in multiple categories including overall performance, reliability, call quality and text message performance. On his Twitter account, Legere sarcastically congratulated his competitors for posting such strong results “LAST year” and went on to say that the data used in the study is “slanted” and “out of date” even though it was conducted in the second half of 2013.

Legere has admitted in the past that T-Mobile’s network has been a pain point for many customers, particularly out in more rural areas where its coverage is particularly lacking. However, the “Uncarrier” has been making some major moves to improve its spectrum portfolio, particularly earlier this year when it paid Verizon $2.37 billion in exchange for spectrum on the coveted 700MHz band that will help improve its LTE coverage to more than 150 million consumers.

Nonetheless, it looks like T-Mobile still has a lot of work to do. If Legere doesn’t like the results of “LAST year’s” tests then he can do something about it by making sure his company shows major improvement on this year’s tests.