I've read on other forums of people using a 64 with varying results. Some worked fine and some had little glitches. I seem to remember that some had a warning message from their phones, but just continued anyway with no problems. If you find a good deal on one, you can afford it and need the extra storage space, it won't hurt to try it. You can always sell it without much trouble if it doesn't work for you.
You might research it on some of the other forums first since I stopped following the threads a while back. I'm not even close to filling up the 32G I took out of my Thunderbolt.
