The current logo of T-Mobile is not a bad logo. It is professional and I love the way of it is been used
(in my opinion; If I look around at their products). But there is also something I don’t understand about it.

T-Mobile is very kind in their commercials and shops, they are cool, have sense of humor, are amusing and they have a great service ofcourse. But if you look at their logo I can’t see any of those characteristics. It looks way too corporate because of the serif font, it’s businesslike. Ofcourse they have their principles and thought really good about it but I wanted to put those characteristics what I see in T-Mobile in a new logo.