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On iPhone you can change your name from 'Bob's iPhone' to 'Bob is brilliant' or something. But I can't seem to find a way to do this on Sony. Please if you do know how can you give instructions on how to get there.
Thanks
Settings > lock scren & Security > under Lock screen > lock screen preferences > Lock screen message
Hi @Junde, welcome to our forum!
I'm afraid that there is no way to rename your device completely, however you can change the name of the device when it is found by other devices using Bluetooth to make it easier to know which devices is which.
To do that, go to Settings > Bluetooth > three dots in the top right corner > Rename this device.
You can also add a screen lock message if you follow the instructions given by @uliwooly.
I hope that answers your question!