Look at your call log — some networks will show a network identifier even if the number is private. Check voicemail — callers ...
To call your voicemail on an Android phone, open your phone's dial pad and hold your finger down on the "1" key.
A new feature for iPhones screens calls, similar to a technology available for Android users. Here’s how to activate it. By Brian X. Chen Brian X. Chen is The Times’s lead consumer technology writer ...