> says?

fwiw OED2 says this:

colloq.

Also 'phone. [Abbrev. telephone: telephone v.]

a. trans. = telephone: telephone v. 1c. Also const. up and with advbs.

b. intr. = telephone: telephone v. 1a. Freq. with particle as phrasal verb or with advbs.

c. trans. Const. in. = telephone: telephone v. 1b.
The first citation is from 1889; Scott Fitzgerald uses it in The Great Gatsby in 1925 and Eugene O'Neill in act 3 of Great God Brown in 1926 - so I guess whilst it's certainly colloquial it has good grandparents by now!