Landline phone numbers in Kunming, capital of Southwest China's Yunnan province, are being increased from 7 digits to 8.
From Dec 16, the number 6 will be added to the start of all numbers, city authorities said.
The change is the first since 1992.
The art of picking a ripe watermelon has sparked a heated discussion on China's social media.
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2016 legislative and political advisory sessions