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[Chihiro usually keeps both his phone with him at all times, connecting both his messenger accounts and e-mail inbox into it in case of urgencies. So yeah, leave phone-calls or any kind of messages and he'll likely to answer real quick! Unless the mun screws up Unless he can't be reached, you'll be hearing his voicemail;]

"Hi- um, this is my phone, um... Chihiro Fujisaki's. I'm really sorry but I might have something important that I can't answer your call, but please leave a message...!"