
"Side note: A class 4 card may not work because it is to slow. There is no max size for your phone the 128 GB is "just" put in the spec because that is the current max size for microSD cards and SDXC" (And from 32 onwards you can not use FAT32 formatting). The difference between HC and XC is that the size of HC is between >2 and 32 GB and the size of XC is 32 GB to 2TB. So you can use any of the microSD cards you find conforming to this, or the lower-spec SDHC standard. And since it's a standard, that's what matters. The important spec to remember is that the Lumia 640, and all new Lumias for that matter, supports the SDXC standard.

Will it accept HD and XC type cards? Are there any capacity limitations?" - Forums member Medwynd "The only thing listed on the microsoft spec page is that it will take MicroSD cards.
