At my college, people normally post their numbers and availability on our party Twitter page. The rates usually range between $1-5 depending on where you want to go: To a party, back to your dorm/apartment, Sheetz, etc. To check if they’re real college students or not, I usually type in their numbers in the Messenger App, which connects me to their Facebook profiles.
Although, I’ve never heard of any contracted Uber and/or Lyft drivers where I go, which is quite weird for a college town.