3900 1820 — Spam Report / 垃圾電話報告

About this number / 關於此號碼

3900 1820 often repeats private loans, debt consolidation, or balance-transfer pitches, which is why many users read it as a negative finance-related junk call. In the available reports, 3900 1820 usually focuses on 財務借貸 related promotions or checks. If you have answered 3900 1820 before, adding your own report can help others identify the same pattern faster.

3900 1820 這類來電多與免文件批核、特快放款或稅貸優惠相關，普遍被視為高滋擾性的財務來電。 回報資料中，3900 1820 的目的多與 財務借貸 推廣或核實有關。 若你曾接聽 3900 1820，補充回報內容亦有助其他人更快辨識同類來電。

What to do / 應對方法

Do not return calls to unknown numbers. If you did not expect this call, it is best to ignore it. You can block this number on your phone.
不要回撥陌生號碼。如果你沒有預期此來電，最好忽略它。你可以在手機上封鎖此號碼。

How to block / 如何封鎖

iPhone: Settings → Phone → Blocked Contacts → Add New.
Android: Recent Calls → tap the number → Block / Report spam.