I have both overhead storage bags and they are excellent. Blanket goes up there, heated vest, map books binder and insurance papers, binoculars, windshield wipe cloth, you name it.
For the phone however, why not keep it in an X Ram mount up in the left corner? That way it's safe and you can orient the mount so that the phone's camera and video functions can be used. On mine I can recharge it on the fly while in the mount, from a USB socket in the dash voltmeter. Velcro straps on the roll bar keeps the cord out of the way. You can see the X mount though the phone's not in it.
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