6 files declare their use of PhoneNumberSettingsException in SMS Framework 8

PhoneNumberVerification.php in src/Provider/PhoneNumberVerification.php

SendToPhoneForm.php in modules/sms_sendtophone/src/Form/SendToPhoneForm.php

SmsEntityPhoneNumberProcessor.php in src/EventSubscriber/SmsEntityPhoneNumberProcessor.php

SmsFrameworkPhoneNumberVerificationTest.php in tests/src/Kernel/SmsFrameworkPhoneNumberVerificationTest.php

SmsTelephoneWidget.php in src/Plugin/Field/FieldWidget/SmsTelephoneWidget.php

sms_sendtophone.module in modules/sms_sendtophone/sms_sendtophone.module

Provides hooks for Send To Phone.