Contacts in James's phone:

Sirius: Serious White
Remus: Wolfy
Peter: That one random guy
Lily: Lily flower

Contacts in Remus's phone:

Sirius: loud
James: annoying
Peter: normal-ish
Lily: normal :)

Contacts in Sirius's phone:

Remus: Re
James: Jamie
Peter: someone
Lily: Lils

Contacts in Lily's phone:

Remus: Normal :)
James: git
Sirius: git's friend
Peter: loner

Contacts in Peter's phone:

Remus: Lupin
Sirius: Black
James: Potter
Lily: Evans