memory card: sandisk mobile ultra M2 4GB --will work for eksperia Z , or for samsung 4s/5s?
Dear member of SanDisk Community, welcome. (1)
Friend, it can check you in a very simple way.
See the official website of the devices in that you are interested, and see in their respective manuals, in the section: specifications, which recommend card.
Regards, Alfred. (Google translated)