I am on the phone, still (8)
I believe the answer is:
immobile
'still' is the definition.
(thesaurus)
'i am on the phone' is the wordplay.
'i am' becomes 'im'.
'on' says to put letters next to each other.
'the phone' becomes 'mobile' (I've seen this before).
'im'+'mobile'='IMMOBILE'
(Other definitions for immobile that I've seen before include "Not able to move or be moved" , "Can't travel" , "Static" , "fixed" , "Incapable of motion" .)