Nokia 308 - Manual (Page 16)

Set which SIM card to use
You can set the default SIM card to use to make a call, send a
message, or connect to the internet. If you name your SIMs, you can
see at a glance which is, for example, for work and which is for
personal use.
Select SIM manager.
Select from the following:
or — Use the SIM in either the internal SIM holder or the
external SIM slot as the default SIM.
— When a SIM is needed, you are asked which SIM to use.
— Set which SIM to use in different cases. For example, you can
use one SIM to make calls, but another to connect to the internet. To
change the settings, select personalise.
Rename a SIM card
Select the SIM you want to rename, then write the new name.
Tip: To quickly change between SIMs and modes, swipe down from
the top of the screen, then tap the SIM area.
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