My question is similar to this one.
I'm in a similar position as the OP there - I strongly prefer email to calls as calls can be disruptive (since I'm generally working on something else when they call, plus it's a lot more time-consuming than simply answering an email).
The answers there seem to indicate that dropping your phone number from your resume completely can be detrimental to your chances of being considered, which would seem to rule out that possibility.
I do state on my resume that email is my preferred means of contact, but a lot of headhunters seem to ignore that (or miss it completely). My contact appears in the following format:
xxx-xxx-xxxx (Cell) firstname.lastname@example.org (Preferred)
Is there something else I can do to encourage them to email first without looking unprofessional or hurting my chances?