Our mobile screen size dimension seems to be a little limited compared to the data we receive in Google Analytics e.g. we don't have any screen widths of 375px in Analytics but in GA it's listed as the most popular mobile screen width.
Is there any extra configuration required to pick up the screen size or should Analytics work it out from the user agent string?
I contacted Customer Care and they responded by sending me in the direction of DeviceAtlas as they informed me that the mobile screen size dimension is parsed based on lookup tables set up on their end.
I've sent DeviceAtlas a message but I'm not very optimistic that they'll be able to help.
Even if the Adobe data is based on their lookup tables, surely everyone would be facing the same issue with missing screen sizes? I would have thought there'd be a single set of tables referenced by all Adobe Analytics installations (that'd possibly vary by AA library) and that DeviceAtlas wouldn't really have any direct interaction with our implementation of Analytics.
I would reach out to client care and ensure your libraries and implementation are fully up to date.