I would appreciate hearing views on Powertel as i am thinking of...

I would appreciate hearing views on Powertel as i am thinking of taking a stake in what seems to be a nice little business.
My major question is, will VOIP erode their other business segments? I am also interetsed in views as to whether the company can really expect to become a major player (afterall its revenue growth is really rather modest for a company priced as a growth story).

Thanks in advance !