I was going to ask but I just tried so I thought I'd share. I saw some other threads about the Maxx and Ultra and it seems the X has the same issue: Square reader doesn't work.
"Note: At this time, devices that have a microphone input but no microphone output (Square Card Reader, Jawbone UP) are not currently supported."
https://motorola-global-portal.cust...er_detail/a_id/95459/p/30,6720,8882/kw/square
"Note: At this time, devices that have a microphone input but no microphone output (Square Card Reader, Jawbone UP) are not currently supported."
https://motorola-global-portal.cust...er_detail/a_id/95459/p/30,6720,8882/kw/square