Based on the information given the type of service should he use is : Voice over Internet Protocol (VoIP).
Voice over Internet Protocol (VoIP) is a type of internet protocol that allows or enable voice call to be possible across the network.
For a user to make use of voice over internet protocol the user device has to have access to internet as this will enables the user to make successful internet call without any hindrance.
With internet a user can make use of his or her device to call and receive phone call across the internet.
Inconclusion the type of service should he use is : Voice over Internet Protocol (VoIP).
Learn more about Voice over Internet Protocol (VoIP) here:
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