For easier use of the Sprint network
The SIM App and carrier settings include updates for allowing easier use of the Spring Network. Please see the steps below.
The SIM App updates
Check whether the setting of SIM card is latest.
Update carrier settings
Check whether "Carrier" is "SoftBank 18.1" or later.
If "Carrier" is not "SoftBank 18.1" or later, update the carrier settings.
Updating via computer
- Connect your iPhone to the computer.
- Launch iTunes and select iPhone displayed under "Devices" on the left of the iTunes screen.
- When "An update to the carrier settings for your iPhone is available. Would you like to download it now?" is displayed, select "Download and Update".
- Do not disconnect until the update is completed.