Even though Tyson is frequently working from his laptop for the web, he prefers to only communicate from his phone.
When Tyson is using his laptop to following a team through security cameras and wipe the footage once they pass by, relaying information to them could be done just as easily through a headset with as speaking into his phone, but Tyson will always use his phone instead.
He does the same thing for instant messengers that Tyson could access on his laptop as easily as he does his phone, but Tyson will always answer those messages from his phone; even if he has the program open on his laptop to read those messages from.
It’s not a compulsion from his OCD, but it is a way of doing things that Tyson will steadfastly standby.