If the telecom operators had to design the products on the whims of the suppliers because their output is unique, then the suppliers would enjoy absolute advantage in terms of bargaining power. But here this is not the case. Again, since the number of the suppliers is very limited say NOKIA & Ericsson and a handful number of network administrators, they (the suppliers) have this power to leverage on this, because this is limiting the choice of the operators and making the switching cost very high for them.