Matti Makkonen, who died recently, was known as

Matti Makkonen, who died recently, was known as _____?
[A]Father of Smartphone
[B]Father of SMS
[C]Father of MMS
[D]Father of Voice calling

Father of SMS
Matti Makkonen was a Finnish engineer in the field of mobile communications. He was known as the father of SMS after developing the idea of sending messages via mobile networks.

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