Pluspunten
T-Mobile has the feel of a smaller company in that it is a fast paced environment with the ability to create change quickly. It also has the benefits of a large company in that it has good financial backing, and has opportunity for growth both vertically and laterally into different career areas.
Minpunten
The fast pace at T-Mobile can also be a detractor in that everything is considered a fire drill. Along with this, there is little time for lessons-learned, and the company seems to make the same mistakes over and over. T-Mobile asks a lot from the employees in terms of time commitment. There is lip service paid to work-life balance, but that is as far as it goes. For me, 11-12 hour days are the norm, and often weekend work.