Internet/moving

I am moving to a new address and it prompted me to change my plan when I started the moving process online. It is just internet. I was able to sign up for a better plan. It also said I can bring equipment with me and that I can self install at new address. I then read something that I need to return equipment within 10 days. So which one is it? Can I use my current modem at new address or do I actually have to return it for a different one?