151 is one of the number segments of China Mobile.
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151 is distributed throughout the country and you must provide the last 4 digits of 151.
The number beginning with 151 is China Mobile. But now you can transfer the number to the network, maybe someone switched to Unicom or telecom. China Mobile Communications Corporation: After continuous innovative operation, China Mobile has formed a value-added business development pattern with nine bases such as wireless music, mobile reading, mobile games, mobile video, mobile animation, Internet, e-commerce, location, 12582 and other professional companies such as China Mobile Internet of Things Company as the main body.