Originally Posted by
D582
What you can do is have multiple devices signed into the same Apple ID, so if you move the other SIM to an old iPhone, as long as it signs and registers then you can send and receive from that number of the other phone.
This might work with dual SIM iPhone as well but never tried that
It does work with Dual Sim. So long as that SIM is active... you can choose to originate messages from that number... even if you have Cellular data and voice using the other sim.