Question

There are two main types of cell phone networks (GSM and CDMA) used in the world. CDMA is used primarily by Verizon and Sprint in the United States. GSM is used by AT&T and T-Mobile in the United States, as well as most of the rest of the world. In the United States, customers of AT&T and T-Mobile can receive calls from and make calls to customers of Verizon and Sprint. This indicates that:

	a) regulation is the reason that consumers can call users of different networks.
	b) there is only one cell phone network.
	c) the lack of interconnectedness raises costs for carrier services.
	d) there is interconnection across the networks.

Answer 1

Ans-(d)

This indicates that :there is interconnection across the networks.

The option A seems to be invalid as nothing such thing is mentioned about regulation in the question,option B is invalid because it is clearly mentioned that there are two main types of network system.The third option is also not mentioned clearly in the question.The option D seems to be correct because it is mentioned in the question clearly that customers has mutual excess to both the types of networks,they can receive and make calls using both.This is only possible when the both types of networks are closly interconnected to each other in the US.