How to call Unicom's overseas customer service phone number

Hello, if you need to consult or complain about using international roaming service or roaming service in Hong Kong, Macao and Taiwan overseas, you can call Unicom's special customer service phone for international roaming and roaming in Hong Kong, Macao and Taiwan (the mobile phone dialing method is: (+8618610) or (international access code) 86 186655. The hotline provides roaming users with 7×24 hours free service (free only when users dial with China Unicom's mobile phone number). Users can also call their hometown customer service telephone number 100 10 to get China Unicom's 7×24-hour service, but calling their hometown customer service hotline 100 10 will charge users for international roaming and roaming in Hong Kong, Macao and Taiwan.