Messenger Call Service
US /ˈmesɪndʒər kɔːl ˈsɜːrvɪs/
UK /ˈmesɪndʒər kɔːl ˈsɜːrvɪs/

1.
Messenger通話服務
A feature within the Messenger application that allows users to make voice or video calls to their contacts over the internet.
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I used the Messenger Call Service to talk to my friend who lives abroad.
我使用Messenger通話服務與住在國外的朋友通話。
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The new update improved the quality of the Messenger Call Service.
新更新提高了Messenger通話服務的質量。