SoftBank 830CA User Manual page 269

Mail
SMS Server Settings
Start Here d Settings
Change SMS Center Address
Reset to SoftBank SMS Center
Address
13
13
-24
d Connection Settings
819066519300
International or Unknown
819066519300 is preset at the time of purchase. SMS may become unavailable if
・
Center address is changed.
Reset d
d SMS center selection
d Enter SMS center address
d
Enter Security code d
d
d
YES d