Alright, maybe this is a "Mobile Master problem", but I had multiple devices even before I became one so maybe it's of interest to a wider audience. When I wish to change a phone, I have two options: 1. Physically swap SIM card. Doing this on a regular basis exponentially increases the risk of causing damage to the contacts inside the SIM tray. Plus, I use phones with 3 different SIM formats so adapters are necessary (which can also damage the SIM reader). All in all, I avoid this method. 2. Have multiple SIM cards and change the active card via Self Serve (what I do currently). I have a file on my OneNote keeping track of my SIM#s, but it's really a tedious process. My proposal: Allow us to register multiple SIM cards per line, but limit only one to be active at a time. Then, when we want to change our SIM#, we can just select from a list. To borrow from an idea posted by Chad, nicknaming each SIM card would make it even easier. Any interest in something like this?