Do you seek permission to call?

Way back in time before phones, people would call unannounced, to others' houses. It was acceptable to do so, although the butler might not give you permission to enter, you had to give him a calling card first. When phones were invented, people would then phone before calling around to your house. Calling unannounced was frowned upon. Hawkers were positively rejected. Would you call on a customer’s home or office unannounced? When email was invented, people would email to fix up a time to phone. Phoning unexpectedly was positively frowned…

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