I have had my private cell phone number for many years (T-Mobile), and everyone knows it. In addition, I have a side business and I have that number everywhere. They gave me a cell phone at my day job (ATT). I carried 2 cell phones around for a few months but it's getting too much now. Plus my private cell phone is in need of replacement. How can I combine both? I know there are phones with 2 SIM cards but that's not an option at this moment because the phone they gave me at work doesn't have 2 slots. Thank you in advance for any advice you can provide.