okay so I know hardly anything about phones and technology.. today i seen that my partner had open on his phone his security section on fb messenger. In the list of devices it showed several active sessions all with the name of the phone which is a Sony experia z5 premium, but it also showed one as unknown device. The unknown device showed as active now so obviously it was the Sony because I had it open on messenger and it was active.. I’m just wondering why it would show as it’s proper name but also as unknown device? My partner claims he’s no good with technology stuff but I know that he is.. any help is greatly appreciated please