**Potential minor spoilers for those who have not played**
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That was Ashe's phone.
At some point in the party, Ashe loses her phone (it shows the phone on the floor). Presumably, Isabella picks it up thinking it's hers (this isn't shown). She realizes later it isn't hers when she's arguing with Talia.
Ah K. I don't recall the MC ever losing her phone on the S route. But I installed scrappy's mod and it unlocked all the K C scene routes Theres a C scene involving Rachel and that gross tank looking thing banging in that room right near the end and the MC was trying to stop it but she couldn't find her phone.
