Sorry but no. Our first priority is integrity which is why we won’t create something that can be used to violate carrier fair use act. The second reason we will never impelement this is that it’s a poor user experience. If there’s a power outage, or the cell phone housing the SIM card goes dead, messages aren’t sent. It’s a disaster. I know many folks are looking for savings (that’s why we love AppSumo right?) but using a SIM car instead of a proper carrier is stepping over dollars to pick up dimes. It’s a poor business plan that doesn’t serve anyone well my friend. It’s better to see the value in the service that we’re selling, and make sure we charge appropriately so we can all make a fair profit. Going the cheap route always causes issues for the end user.
There are plenty of other companies who will allow you to use a SIM card, but we will never be one of them.