Hot answers tagged car-dock
You may get what you want, if you find a model that includes this functionality already (like e.g. the older Archos G9 tablets did) but it will not work out of the box for most models. There's the autopatcher project (thread on XDA) that enables 3G dongles for modem-less tablets (but it is limited to certain custom ROMs like CyanogenMod, AOSP, rooted Google ...
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