I'm not sure what purpose the contacts serve for a mage, as their enhancements don't give you any boost to your spell targeting.
A4BG: why would a mage need a good commlink?
Everyone should have at least a Device Rating 4 comm (that's the point where the 2,500 one falls) to keep their info and other shiz secure except for the Decker since his device can do what a comm does along with its other stuff. Not like there's that many of the trap ones anyway.
Having a high Willpower will help when your connected to your commlink so I don't think it's as important for this character to have as high rating of commlink.
from the Book:
When a defense test calls for a Mental attribute,
use the owner’s rating. Even if she isn’t currently defending
or even interacting with the device, her previous
interactions and settings affect the defense test. If
a device is completely unattended, the Device Rating
stands in for any Mental attributes an icon needs but
doesn’t have. For example, a device that an owner sets
and forgets, like a door lock, uses its Device Rating in
place of Intuition as part of the defense pool against a
Control Device action.
Should still talk to GM. He/she might insist he get Rating 6 Commlink. I don't give my players too much grief unless they take Meta Link, and even then most of the time it works just fine.