Got new sim card for new phone, employee I bought it from told me I must
download app to activate it. Once I downloaded and opened this app it had no such option. I then went online and eventually found where to do this and put in new sim card number. Once I tried making a call on my new phone I realized that instead of my phone number the phone now has the number of a family member on the same account. Her phone does not work at all. I don't know how this happened. What do I do, I need this fixed immediately we both need out phones for work.
*update: turns out there's a little menu thing on top that automatically selects which number it is. I switched it to mine and tried to change everything back but nothing works because both my new and other person's current sim cards are "already in use" and its not letting me switch