Sadly the import didn't go well. I created a test file of 3 messages in csv format.

This is one of the messages with some details obscured :-
3281;RTCOM_EL_EVENTTYPE_SMS_MESSAGE;1;1387550488;1 387550488;1387550490;1;0;0;0;ring/tel/ring;<SelfHandle>;999999999999;Joey Joeyy;;"Yes thanks. It took a bit longer than the outward journey but I made it :-)
Have a lovely Xmas too. Love C xxx";9999999

Running the import via SSH, it produced the following message on screen - [D] workMessage:138 - message from/for "3281" added

When I look at the message on the Jolla, it shows all of the above information.