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Custom Activity Field Help

I would like to replicate the Phone and Email fields on Task where the Phone and Email fields populate with the contact information when save is clicked . I want to have the Mobile and Other Phone fields from the Contact on the Task page and have them populate onclick of the Save button. Can this be done through a formula field or will I need to write a trigger.


I have tried Contact.MobilePhone 

and I have tried Contact__r.MobilePhone


Neither of these work so I just want to check if I need to write a trigger (or worse override the pages with VF Pages).


Any suggestions would be great. I just get Contact or Contact__r do not exist as an error in the formula field