Competition

The competition between operator companies is getting sharper and sharper.
For example, indosat company is making a promotion of Rp 0,1 for every sms until 100 sms at a certain time.
XL offers long-duration-fun-call-with-cheap-fare package and numerous-times-call package.
3 doesn’t give up and offers the cheapest fare for phonecalls and sms to the same operator.
As the consumer, I just enjoy all of those promotions.
But how do these operator companies survive and gain profit in their business?
For information, I’m waiting for indosat’s promotion which will launch Groovey number (perdana groovey) and im3 internet voucher unlimited (just Rp 5000)