Sony Xperia Z4 User Manual page 149

Setting the Carrier
At time of purchase, handset is preset to connect
automatically to an appropriate carrier in user's current area.
A specific carrier can also be selected manually.
In Home Screen, (Settings)
More
Mobile networks
Mobile network settings open.
Service providers
Service providers list opens.
・Search networks to show available networks.
Tap network to connect to
The selected carrier is set.
・ In Service providers screen, Tap
Automatic to connect automatically to an appropriate
carrier.
・ In Service providers screen, Tap
and select a carrier in AVAILABLE NETWORKS to connect
to a specific carrier. If you power on handset again after
setting a network operator manually, the network operator
may be changed.
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