Mobile phone cradle & antenna removal.

A couple of the cars Ive seen that I like the look of have mobile phone kits installed so just wondered if anybody can offer some advice....
How easy is it to remove a mobile phone cradle (hard wired) and antenna that
have been installed in a car?
Are the antennas just stuck onto the exterior window, and do they just pull off?
If the cradle is screwed into the dash, are there any things you can get to repair the damage left behind?

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