Missed call scam from +231 ???

A new international pay-per-call phone number scam has been identified from LIBERIA(+231).

These calls arrive at odd times and often disconnect after one or two rings, not giving the receiver enough time to answer the call. The call appears in your phone log as a missed call and tempts you to return the call.

When you do that, you'll hear a voice saying something like "hello, you have reached the operator, please hold." 

While you're doing that patiently, you're getting charged per minute as per international call rates. 

Some reported numbers are: 

+231224203060
+231224209787
+231332580644
+231332530487
+231330670151
+231330670146
+231330670140
+231332580851 
+231332580044
+231880679705
+231332586027
+231330720143
+231332580118
+231332587571
+231332595063
+231332513187

How to safeguard against missed call spams??

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