so here's the deal.. I ordered a white 64gb X from Best Buy that arrives tomm. I really wanted a 256 but the date was nov 25 so I went 64, but now I'm regretting it kinda. Is there any way I can get a 256 instead of the 64? Also if I open and use the Best Buy phone does that screw it up? I need a new phone I've been struggling with a dying 5s on its last leg Lastly.. can 64 in any way be manageable ?