telefonieren {vi} [telco.] - to make a phone call; to call  [Am.]; to phone; to ring (up) [Br.]; to telephone 
telefonierend  - calling; phoning; ringing telefoniert  - called; phoned; rung er/sie telefoniert  - he/she calls; he/she phones; he/she rings ich/er/sie telefonierte  - I/he/she called; I/he/she phoned; I/he/she rang er/sie hat/hatte telefoniert  - he/she has/had called; he/she has/had phoned; he/she has/had rung mit jdm. telefonieren  - to speak to sb. on the phone; to call sb.; to ring sb. miteinander telefonieren  - to speak to each other on the phone