Sen2012
Newbie
There's 16gb internal built in (8.92 usable) already. It supports up to "32gb" microSD, but that was also before 64gb microSD's were available. There have been reports all over (I found via google search) that the 64gb cards seem to work fine on "newer" phones. I saw one example where the Thunderbolt identified the max capacity of the card, so I'm assuming it'll be no issue with the Photon.
I already ordered this 64gb card and even if it doesn't identify the full capacity, I'll have it ready for when I upgrade my phone again (whether this year or next year).
I ordered the card. Wow, what a great price compared to everywhere else.