Does the Datajack description actually specify a location? Or can it go on your Kneecap? I know historically it commonly goes somewhere in the skull, but you can find Artwork examples of the Datajack ports being on the neck, on the temple, on the back of the head...
AFB so I can't check. As a GM if a player asks for a datajack belly button I really don't have an issue with it. Clearly YMMV.
Datajacks are listed as Headware, so I'm pretty sure they have to go in your Head someplace.
Data jacks are wireless anyway. You can connect to your commlink wirelessly if it's inside a skin pocket.
Not the point... if you have an implanted Commlink in your head, you have a neural connection (not DNI) that allows you to mentally control basic functions whether or not the wireless is enabled. So even if the wireless were disabled, you could still check your calendar and such.
If you have a Datajack in your head, and a Commlink in your pocket, and you disable the wireless on the Commlink, then you will need to physically interact with the Commlink to turn that back on again.
And as for relocating Datajacks... their purpose first and foremost is to provide DNI. They pipe digital data straight into the various sensory centers of your brain. Which means there need to be connections to those places in your brain. You can't get to the visual, auditory, or any other cortices from the foot...