Acer Z160 - Manual (Page 47)

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Selecting which SIM to use when making a call
If you have set Voice call to Always ask, you will be
asked which SIM to use each time you make a call. Enter
the number, then tap . A dialog opens; tap the SIM
you want to use.
Selecting which SIM to use when sending a text message
If you have set Messaging to Always ask, you will be asked which SIM to use each
time you send a text message. Enter the message and recipient information, then
tap Send. A dialog opens; tap the SIM to use and the message will be sent.
Identifying calls
Whenever you receive a call, the caller’s number will be shown using the color
defined for the SIM that the call is being received on. You will also be shown the
name of the SIM receiving the call.
In the call log, the name of the SIM will be shown beneath the number of the call --
whether the call was missed, answered or was an outgoing call -- in the color you
defined for that SIM.