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I can't call 100 10 now, and I can't get a message. How to re-open foreign numbers?

If there is no international roaming service and you roam to Hong Kong, Macao and Taiwan or other countries, you will not be able to use Unicom's mobile phone normally.

You can log in to China Unicom online business hall > tariff area > international roaming charges > open roaming rights, and open international roaming service by yourself. The final result will be subject to the page display.

Log in to China Unicom Mobile Phone Business Hall APP > Services > Handling > Outbound Roaming > My International Business, Self-help International Roaming Business, and the final result will be subject to the page display.

Call the international customer service hotline for consultation and handle the opening of international roaming service.