Telephone, Internet and Mail in Asia

Wherever you go, you think of friends and family at home. A short phone call, a quick text message or a pretty postcard to say "Wishing you were here!" are part of every vacation. What do such things cost in Asia? Are there Internet cafes everywhere? What about mailboxes/post offices? Is it better to buy a foreign SIM-card? Be the first person to write about this topic!
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