I used up the trial data in a few days on my G12. Never renewed it or added it to my cell plan. I just used my iPhone as the hotspot and let my boys tether their iPads. I just make sure to keep my phone charging while tethered.
As far as using the BMW remote app...you don't need a data plan for that.
The main advantage I see to having the vehicle subscribed to a data plan is possibly a stronger cell signal. I'm assuming the shark fin has the antenna versus your phone in the center console.
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