I am pretty bad with CSS...
If we are in a DSDS device and so we add the ```.dual-sim``` class at https://github.com/etiennesegonzac/gaia/blob/bug-947131-dsds-call-log-display/apps/communications/dialer/js/call_log.js#L81 but we don't add ```first-sim``` or ```second-sim``` because the group's ```serviceId``` value is unknown at https://github.com/etiennesegonzac/gaia/blob/bug-947131-dsds-call-log-display/apps/communications/dialer/js/call_log.js#L460 does ```[data-type="list"] aside.icon.icon-incoming``` rule apply?