What should I do if I travel to Hong Kong and Macao and want to call back there?

1, before traveling, you can open international roaming service at Unicom or mobile business hall with your master ID card.

2. After arriving in Hong Kong, just buy a local phone card at 71 (7- 1 1) (tell the salesperson to call the mainland for 0.25 minutes). There are instructions on the outer package of the card, generally 00 186+ mobile phone number or 00 186+ area code+phone number.