We're looking into an option to support dual SIM, but for now that's a dumb dead switching of SIM only (SIM Shift, DSSS, Pseudo-Dual), since the modem module firmware doesn't support real Dual SIM Dual Standby (DSDS) *). We hope for implementig this SIM multiplexing in a way so that a possible future modem firmware upgrade might support it. So far we heard no details from Cinterion/Gemalto regarding this, so we neither know if such firmware upgrade ever will come, nor can we do better than just guessing how we best interface the multiplexer to the modem. We also need to check certification situation which maybe introduces restrictions what can be done to the SIM interface.
We're not really considering to place a second modem module in for "Dual Talk" (DSFA)

Simple bottomline: we would like to get true dual SIM, but for now modem support is missing for that. We might be able to offer electronic SIM swapping (only one of both SIM active at any time. IOW you're not available on two numbers concurrently)

cheers
jOERG

*) don't ask me what happened to the recent version of this wikipage, it seems somebody removed a lot of useful info, thus this link is to an archived version