Spam short message (SMS) had been a big problem that disturbed cell-phone users and mobile operators recently.

垃圾短信是近年来困扰手机用户和运营商的一大难题。

youdao

Spam short message (SMS) had been a big problem that disturbed cell-phone users and mobile operators recently.

垃圾短信是近年来困扰手机用户和运营商的一大难题。

youdao