I am looking to use my iPhone as a hotspot and have some questions. I have a data plan with my phone, so when I hook up another device and use it will it just use the data from my plan or will it charge me separately for the data that I use when my phone data is being used by another device? Second part to this question is that it is asking me to enter a password to create the hotspot. When would I have set up this password? Is it the main password for the phone? Thanks for the help!