New iPhone SE not alerting when text message comes in when screen is locked.
My new iPhone SE is not alerting to incoming text message when screen is locked. No sound, no vibration. The switch on the side is up (on). If phone is active, then a tone sounds quietly.
In Settings: Text tone is chosen; iMessage ON; MMS Messaging ON; Sounds & Haptics 60% volume.
iPhone SE, iOS 13