Three new articles on the topic published this month:
British and American phone calls – NEW
50 ways to answer the phone (in English and other languages) – NEW
Cultural differences in telephoning – NEW
These links and many more on my teaching telephoning page, and also lots more cultural differences ideas and materials here.
TEFLtastic 
One more differences that I didn’t include; apparently when someone transfers a call to you, you say “o-denwa kawarimashita” (literally “The phone has changed”) in Japanese. Much better than the English “Hello?”
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