Graham bell was a Scottish scientist..he invented the first TELEPHONE .... and we say hello  while picking up the phone because it is a way to greet is a way to give respect someone...when we meet someone we say hello or anything like this in our language....

hope it helps u..
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Graham bell was a scientist  and he was invited the 1st Telephone. and  why we say hello while picking up the phone why means when Graham bell    first call  her wife he said hello. why means by lovingly he said hello.   still  its became  common to say hello. while picking up the phone..........
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the actual reason why we say hello is that it was the name of graham bell's wife.Her full name was Margret Hello. Hello was her pet name kept by Graham bell.