User blog comment:Hidden Scorpius XI/My Impressions on RWBY Chibi, Episode 2/@comment-3257939-20160516031404/@comment-25396609-20160516033442

given they will effectively become co-workers (in a way, given they would be going into the same field working in the same region) upon graduation, it makes some degree of sense that they be somewhar more familiar with their teachers.

in addition, it is far from uncommon for college students to have direct contact numbers for their professors, for various reasons.