Hi matrix867, Welcome to the Samsung Members Community Canada. In this Community we Samsung Members assist each other with any suggestions or troubleshooting issues with our Samsung devices. You can also share pictures taken from your Samsung device in the Galaxy Gallery. Please let us know if you have any issues with your Samsung device.
Yes it's perfectly normal to see "phone is starting up" after unlocking your phone, if it was powered off. It would not be normal if the phone was on, but only locked, unless it restarted on it's own for some reason.
Hi, Thanks for the reply.
The model number starts with SM and it's something like SM-G973W(for Galaxy S10). You could find it in Settings >> About Phone.
If possible, take the picture of the message screen with another device instead of a screenshot.